Apollo 8 Mission Report Figure 8-2 showing the large variations in the times of planned sleep periods relative to a 'normal' start of sleep at 2300 at the Cape. These variations were due to the work load of this first voyage to lunar orbit.
Sleep Comments in the Apollo 11 Lunar Surface Journal
Elapsed Time (hh:mm:ss)
||Armstrong, from the
1969 Technical Debrief - "There was still a full
truckload of equipment inside that cockpit at the end
of the EVA. It's just a bunch of stuff, and I
was glad that we were able to get rid of a lot of it
and finish the jettison before we started our sleep
period. With all that stuff in the cockpit,
there's really no place left for people to relax."
||CapCom wishes the crew
a "good night". At 115:50, NASA's Public
Affairss commentator reports that the Surgeon doesn't
believe that Neil is closer to sleep than
'dozing'. Output from Buzz's biomedical sensors
are not being monitored during the rest period.
Armstrong - "I think it was my position (that) was bothered by the noise (of the glycol pump) more than yours, because you were on the floor - right? - and I was on the engine cover with a loop that'd I rigged up (using a waist tether) to hold my legs, hanging from (the AOT guard) up there (at the front of the cabin). And my head was back to the rear of the cabin and there was a glycol pump or a water pump or something very close to where my head was. But the temperature control was probably the most troublesome."
[A muffler was installed in the glycol pump for subsequent missions. It reduced pump noise to acceptable levels.]
Armstrong - "(The quality of the rest) was poor in my case."
Aldrin - "I'd say the same thing."] <p>
[Armstrong - "And for a lot of physical reasons that I mention (in the tech debrief extract, next); and also, I'm sure, just the (problem of) getting unwound from the excitement of that day was contributing, too."
||Armstrong - "We cleaned
up the cockpit and got things pretty well in
shape. This took us a while, and we planned to
sleep with our helmets and gloves on for a couple of
reasons. One is that it's a lot quieter with
your helmets and gloves on, and then we wouldn't have
any mental concern about the ECS and so on having two
loops working for us there."
Aldrin - "We wouldn't be breathing all that dust."
Armstrong - "That was another concern. Our cockpit was so dirty with soot, that we thought the suit loop (filtered oxygen going directly from the ECS to the suit and then back again) would be a lot cleaner."
Armstrong - "A couple of comments with respect to going to sleep in the LM. One is that it's noisy; and two is that it's illuminated. We had the window shades up (that is, covering the windows) and light came through those window shades like crazy. They're like (photographic) negatives and a lot of light will shine through."
[There is no discussion of the window shades in the Apollo 11 Mission Report. However, the fact that none of the other crews reported problems with light coming in suggests that the shade design was modified to use a more opaque material.]
Armstrong - "The next thing is that there are several warning lights that are very bright and can't be dimmed. The next thing is that there are all those radioactive illuminated display switches in there. Third, after I got into my sleep stage and all settled down, I realized that there was something else shining in my eye. It turned out to be that the Earth was shining through the AOT (Alignment Optical Telescope) right into my eye. It was just like a light bulb. If I had thought of that ahead of time, we could have put the Sun filter on or something that would have cut that light out. The next problem we had was temperature. We were very comfortable when we completed our activities and were bedded down. Buzz was on the floor and I was on the ascent engine cover. We were reasonably comfortable in term of temperature. We had the (LM cooling) water flowing and the suit (oxygen) loop running. We had to have the suit loop running because our helmets were closed. After a while, I started to get awfully cold, so I reached in front of the fan and turned the water temperature to full up - Max increase. It still got colder and colder. Finally, Buzz suggested that we disconnect the water (flow into the suits), which I did. I still got colder. Then, I guess, Buzz changed the temperature of the air flow in the suit."
[The cabin temperature through the rest period was in the range of 61 to 62 degrees Fahrenheit or about 16 degrees Celsius. During the EVA prep at 108:38:36, Public Affairs reported to the press that the cabin temperature at that time was 61 degrees Fahrenheit, a comfortable temperature while they were working in the suits, but not when they were trying to sleep. For subsequent missions, ECS operating procedures were modified to produce a comfortable cabin temperature of about 71-72 degrees Fahrenheit.]
Aldrin - "Yes. We fell victim to a time constant. Once we noticed it going bad, there wasn't anything we could do about it. In addition, because we were trying to minimize our activities and stay in some state of drowsiness, we didn't want to get up and start stirring around, because it would be that much harder to get back to that same state again. So we tried to minimize our activity. We underestimated how much light was coming in through the windows. There must have been a significant amount of light and heat coming in and just being reflected off the surface. We had no feel for what gas-flow setting we should have had, because we'd been on the cooling all the time up to that point while moving around I'm not sure that there's much control over that anyway. We finally disconnected the oxygen flow."
Armstrong - "But that requires that you take your helmet off, so that you can breathe when you turn the suit disconnects (that is, shut off the flow from the ECS into the suits). This means that it gets noisy again, and all you hear is a glycol pump and stuff like that. This was a never-ending battle to obtain just a minimum level of sleeping conditions, and we never did. Even if we would have, I'm not sure I would have gone to sleep."
Aldrin - "I don't know who was on Biomed at the time (it was Neil), but I feel that I did get a couple of hours maybe mentally fitful drowsing. I'll have to say that I think I had the better sleeping place. I found that it was relatively comfortable on the floor, either on my back with feet up against the side, or with my knees bent (and his feet on the floor, the cabin width being insufficient for him to stretch out). Also, I could roll over on one side or the other. I had the two OPSs stacked up at the front of the hatch, so there was ample room on the floor for one. But there wasn't room for two."
Aldrin - "To cut down on the light level, we're just going to have to do something with the window shades to make them more effective. I think sleeping with the helmet on will keep the cooling down and is probably a good, reasonable way to go as long as you're going to keep the suit on. Unless some change is made, we'd never even think about taking the suits off."
Collins - "Apollo 12 is planning to take their suits off. With the longer stay-time and a couple of EVAs, they're planning to take their suits off."
Aldrin - "I think they ought to think a little more about it. I don't know what the temperature would be in there. I got the impression that it was a lot cooler outside the suit than it would have been inside. I don't feel that having the suit on in one-sixth g is that much of a bother.
It's fairly comfortable. You have your own little snug sleeping bag, unless you have some pressure point somewhere. Your head in the helmet (which has a pad at the back of the head) assumes a very comfortable position. Even out of the helmet, you don't have to worry about what you're leaning against. Your head doesn't weigh that much, and will very comfortably pick just about any position. I just don't see the real need for taking the helmets off."
Armstrong - "I didn't mind sleeping on the engine cover. I didn't find it that bad. I made a hammock out of a waist tether - which I attached to some structure handholds - to hold my feet up in the air and in the middle of the cockpit. This kept my feet up about level with or a little higher than my torso."
Aldrin - "Well, you were back out of the mainstream of the light, except for the AOT. I think we could fix that up and obtain a more horizontal position or the capability to roll from one side to the other. That's just something that has to be worked out. It wasn't satisfactory. If we had known then what we know now, we could have preconditioned the cabin a little bit better (in terms of temperature). We needed to start at a warmer level by turning the water off, thereby storing a small amount of heat."
Armstrong - "That's just one of those areas that didn't occur to us. It clearly needs some more work."
[Ultimately, the Apollo 12 crew decided not to take their suits off between the two EVAs. However, they took their helmets off, kept the flow of cooling water off, connected the hose bringing oxygen from the ECS to the suit O2 outflow connector (which put warm oxygen from the ECS into the suit at the feet and wrists) and the outflow hose to the inflow connector (which returned air to the ECD from the neckring), and strung up hammocks to sleep in. They did not report any problems with noise, excess light, or cold temperatures keeping them from sleep. Neither of them slept more than three hours, but the brief sleep was due to a poor fit of Pete Conrad's suit that was causing him sufficient discomfort that he and Al Bean had to get up early to fix it. The Apollo 14 crew had the same sort of arrangements as the 12 crew but found that they had trouble getting their heads into comfortable positions, perhaps because of the rigid neckrings. In addition, their spacecraft had landed with a significant tilt and, when they were in a drowzy state, the tilt produced a sensation that the LM was about to tip over. That sensation kept them both awake. Starting with Apollo 15, the astronauts got out of their suits after each EVA and it made a world of difference. They were able to get comfortable in the hammocks and, on the whole, they slept soundly. Some of them felt more excitement about the situation than the others did and had trouble falling asleep but, all of them slept soundly for at least a few hours each rest period, and woke up refreshed and ready to go back to work. Neil and Buzz and the other early crews demonstrated the obvious - that it was possible to accomplish a great deal with limited rest. And the later crews demonstrated that simple additions to the equipment list - and confidence in the suit that let them take it off and put it back on three times - made it possible to get adequate rest at a small cost in lunar surface stay time.]
Sleep Comments in the Apollo 12 Lunar Surface Journal
||During the EVA-1
close-out, Pete says that, because of the long day
(17.5 awake at that point), he's "not going to have
any trouble sleeping tonight."
||Capcom asks how they are going to configure their suit hoses for sleep. Pete says Al feels hot and will leave his air hose connected. Pete thinks he'll probably leave his disconnected.|
||Pete indicates that he
is eager to start the second EVA as early as possible
that they may get up early and call Houston.
||In 1991, Al believed
that using hammocks has always been part of the Apollo
12 planning. Hammock discussion.
||Discussion of the
hammocks, the value and problems of sleeping tablets,
and the importance of a good sleep. Extensive
extract from the Technical Debrief about Pete's
shoulder discomfort due to poor suit fit, for which he
takes responsibility, and the re-lacing Al had to do
to relieve Pete's discomfort. During the
Technical Debriefing, Pete mentions that "the cabin
temperature remained good all night. He did
notice his lower legs getting warm and wet
inside the suit and, episodically hooked up the hoses
to circulate dry air to remove any collection of
||NASA Public Affairs
reports that the Flight Surgeon has indications that
the crew is awake. During the post-flight
Techical Debriefing, Pete said that he slept for 4 1/2
hours, woke Al, and that the suit adjustment took
about an hour. It seems likely that they
finished the adjustment at about the time they make
their first call to Houston, at 129:01:50.
||There are subtle
differences between Al's performance on the second EVA
compared with the first. "I'm not surprised. I
think I'm more tired on this EVA, because of the lack
||About 1 hour 40 minutes
into the second EVA, Pete says "I've got the decided
feeling I'm going to sleep tonight." Part of his
tiredness is due to the difficulty of bending the suit
so he can run, but most is probably due to the lack of
||During the lead up to
LM liftoff, Pete mentions that the cabin has been
warmer than Neil's. ECS (Environmental Control System)
operation procedures were changed to raise the
temperature from 61-62 F (16.1 - 16.6 C ) on Apollo 11
to "the low 70s" (about 22 C) on Apollo 12.
Sleep Comments from the Apollo 14 Lunar Surface Journal
||During the EVA-1
Close-out, Ed Mitchell wants to get as much dust as
possible off Shepard's suit because Al was going
to be in the hammock over Ed's and Ed didn't want dust
raining down on him during the rest period. Al's
feet were going to be over Ed's sleep station, they
removed his overboots - and Ed's - because of all the
dust that had collected in them. As Alan Bean
discovered at the end of the first Apollo 12 EVA,
stomping your feet on the ladder rungs on the way up to
the cabin helped remove dust from the legs and boots.
||Because they are already
1 hr 15 min past the planned start of the rest period
and still have about a half hour of tasks to accomplish
before getting in the hammocks, Houston shortens the
planned EVA debriefing. Houston won't wake them
early, but if the crew wants to start the EVA early,
Houston will support them. Shepard says "Okay,
that sounds good. We'd like to plan on an early
egress anyway, so that we'll be in a position to get the
full EVA-2 and still get back in at the regularly
||Shepard requests wake-up
an hour earlier than planned "so that we'll be able to
get in a 30-minute (EVA) extension and still have
time after we get back in (the LM) to have a leisurely
re-stowage." Houston tells him they will support an even
earlier start, so they agree on wakeup 1 1/2 hours
early, which is transcript time of 128:20. Shepard
says, "I don't think we're going to sleep more than 6
hours anyway. And we'll be in bed so that we have
6 1/2 hours." Last comm from the LM is at
121:34:52. During the rest period, the Flight
surgeon had indication that Shepard was alseep by about
121:58. Mitchell was not being monitored.
||In 1991, Ed Mitchell
talked about getting the hammocks up and getting into
them. They slept without helmets, gloves, or EVA
boots. Getting the hammocks properly routed thru
the various suits hoses was tricky; they had rehearsed
the procedure a few times. They did not use
earplugs. A muffler had been installed in the ECS
pump to reduce to an acceptable level the noise that had
disturbed Neil's sleep. They woke several times
because they both had a feeling that the LM was about to
tip over. Ed describes the hammocks as being
uncomfortable and realized that it was the suits that
were causing the discomfort. There wasn't time in
a 32-hour lunar stay to doff and don them between EVAs;
and, perhaps more importantly, there was concern about
jeopardizing suit integrity. Removing the suits
for comfort during the 3-EVA misisons was imperative to
avoid crew exhaustion, which Ed thinks was a bigger risk
to the mission than the possibility that loss of suit
integrity would force cancellation of one or more EVAs
and an early return to orbit. Experience with the
suits gained from Apollos 11, 12, and 14 made it
possible to decide to remove the suits for the Apollo
15, 16, and 17 rest periods.
"Okay. We're up and running this morning.
We're assuming we have a Stay for EVA-2 and our crew
status report is we've had no medication." CapCom
requests a sleep report a few minutes later.
Although they both report 4 to 4 1/2 hours, in Shepard's
case, the mission report statement above, that they got
"little or no sleep", may reflect the view of the
Surgeon, who was monitoring Shepard's biomed data.
||Debrief discussion of the
problem of finding a comfortable position for the
head. Neckring part of the problem. Also, a
pillow would have helped. There is no mention of
pillows in the A15-A17 LSJ. Nor any significant
weight difference between hammocks listed in the Apollo
14 stowage lists and those of the later mission that
could be ascribed to a pillow.
As indicated in the table (below) of Sleep Comments from the
ALSJ, the crew decided early in the planning processes that
they were going to build the mission on a 24-hour Houston
day. Despite the Mission comments quoted above, Dave and
Jim believed that they'd gotten adequate sleep.
Certainly, they got more quality sleep on the lunar surface
than any prior crew.
From the Pilot's Report in the Apollo 15 Mission Report: "The crew was able to sleep fairly well. Noise was minimized by configuring the environmental control system in accordance with the checklist and by using earplugs. The temperature was ideal for sleeping in the constant-wear garment and sleeping bag, or in the constant-wear garment and coveralls. A wider hammock would improve the conditions for sleeping. A slight light leak through the stitching on the window shades interfered with getting to sleep."
Details in Sleep Notes derived from the Apollo 15 Technical Air-to-Ground transcript ( 38 Mb ). No sleeping tablets were taken.
Sleep Comments from the Apollo 15 Lunar Surface Journal
Elapsed Time (hh:mm:ss)
||Full discussion of
reasons for doing the Stand-up EVA (SEVA), including the
value of not disturbing their circadian rhythm.
||During the post-mission
debriefing, Dave said that one advantage of doing the
SEVA and then sleeping before going out for the first
EVA is that their first sleep was in a clean cabin.
||In 1992, Dave did not
remember that the LM tilt was a problem. In 1989,
Jim remembered that the hammocks "were adjustable to a
certain degree ... I didn't notice any problem at
all." During the post-mission debriefing, Dave
said "I was afraid I would be feeling like I was
sleeping heads down with that pitch angling there, but I
didn't at all. " Dave and Jim suggested
modifications to the feet end of the two hammocks to
improve comfort and prevent accidental contact with
||Discussion about the
quality of the sleep and the pre-flight decision to doff
the suits for the rest period. In 1989, Jim said
that he thought the sleeping arrangements in the LM were
better than what they had in the Command Module.
He also thought that the familiarity gained by sleeping
in the simulators was very valuable. He said that
he had the best sleep of the flight that first night on
the Moon, in part because "it was kind of an exciting
day, a satisfying day." Dave took an alarm clock
along on the flight, just in case. (One scenario that
comes to mind is losing comm while they were asleep.)
First Lunar Surface Rest Period
||Houston wakes the crew an
hour early to have them locate and close an oxygen
leak. The cause was the urine transfer valve and
was found quickly. At 115:50, Parker notes that
Jim's biomed data indicated he was sleeping well.
Jim replies, "best sleep of the flight". Dave
comments that he, too, was "way down in sleep when you
gave us a call."
||Debrief extract in which
Jim says the cabin temperature was very comfortable for
sleeping. He slept in his "Constant Wear Garment in the
sleeping bag and did not use the coveralls." Dave
slept in his coveralls "without a sleeping bag. So
I guess we each had two layers on, and it was very
comfortable." They used earplugs, "so noise was no
problem". Dave wore an earpiece, too, in case
Houston needed to wake them. Commented on the
value of a pre-flight vacuum chamber run in the LM to
find-tune the ECS configuration for noise
reduction. Some light leakage through the
stitching around the window covers.
||Houston tells the crew
they are convinced that the urine valve was the only
leak source and is now tight. Dave says they'll
sleep better knowing that Houston will wake them to take
care of any other problems that arise."
||Discussion of the
earpiece. Dave says that there never any problems
with the earpiece used in Apollo coming out of the
ear. CapCom then offers them to option of going
back to sleep for the remaining 22 minutes of the rest
period. Dave and Jim decide to use the time to get
organized for the EVA. There was a pre-flight
agreement to start the EVAs on time, perhaps because of
the fatigue problems on Apollo 14.
||They both got about 5
hours sleep and took no medication.
||Before the second rest
period, CapCom says Houston will try not to wake them
early, as happened in previous rest period because of
the oxygen leak. CDR replied, "Well, if you see
something that you'd like to look at, we'd rather have
you wake us up."
||Jim's biomedical data
indicates that he is sound asleep. At 134:53, NASA
tells the press the cabin temperature is 56 degrees
Fahrenheit (13.3 C). During the post-flight debrief,
Dave was briefly awakened by a call from Houston to the
Command Module. He was wearing the earpiece, but
the fact that he heard the call was due to a mistake in
Houston; someone keyed the wrong comm channel.
Second Lunar Surface Rest Period
||Wake-up call from
Houston. The wake-up was scheduled at
137:55. At 138:53:40, Jim reports that "we both
slept for the full time".
||Dave describes a
simulated rest period he and Jim did in one of the LM
simulators before the flight. They "got a lousy night's
sleep. When you get to one-sixth g, it's just
terrific; but you try to sleep in those hammocks in one
g: not terrific." They did the session in part
because they were the first crew who were going to doff
the suits and they wanted to do that in the confines of
a LM cabin.
||Dave comments on building
the mission around the circadian rhythm and the value of
having the crew all resting at the same time. He
also comments on the value of the Flight Directors and
other managers observe training, so they could
make better real-time decisions that influenced the
timeline. Dave and Jim are currently about an hour
late in starting EVA-2.
||Dave and Jim are running
late - about 1 1/2 hours behind the timeline - and
Houston is anxious to get them to bed. At 151:35:06,
CapCom tells them that the EVA debrief won't be done to
help make up some time. During the rest period,
Houston will assess the tasks for EVA-3.
||Dave tells Houston, "I'll
tell you, the secret to living up here is getting out of
these suits. It really makes the
difference." Dave discusses the need to get the
suits off to get some good rest between EVAs.
||CapCom re-inforces early
statement about the importance of rest. Houston
will insist on a 7-hour rest period starting when they
get into the hammocks. However, there is an
unstated understanding between CapCom and the crew that
the 7-hour clock will start when the crew calls to say
they are in their hammocks, whether they really are or
not. In 1992, Dave thought they did get in the
hammocks about the time they said they were getting in
||Dave calls Houston to
"Start your clock" for the rest period. They were
planned to start the rest period at 151:25, so they are
1 hr 50 min behind. the Surgeon is monitoring
Jim's biomedical data and, at 154:04, reports that,
although is heart rate is beginning to fall, he is not
yet soundly asleep. At 155:03 Jim was
dozing. At 156:00, Jim was not sound asleep.
Third Lunar Surface Rest Period
||During the post-mission
debriefing, Dave and Jim remembered getting sleep on the
third night as good as on the second and that they were
both well rested. Discussion about the value of the
Sleep Comments from the Apollo 16 Lunar Surface Journal
||A technical problem in
the Comand Module resulted in a 6-hour delay in
landing. John and Charlie had awakened at about
91:30 and had planned planned to do an EVA before their
first rest period. They would have started that
first rest period at about 113 hours, after a 21 1/2
hour day. If they had tried to do an EVA after the
delayed landing, they would have had a 27 1/2 hours day
and, in Houston, Flight Director Gerry Griffin was
unwilling to test their endurance to that extent.
||After the landing, CapCom
tells them that he has extensive changes to the Surface
Checklist, which he can read up when it's
convenient. Charlie sums up the general feeling in
both the LM and Houston, "Jim, I feel exactly like I
thought I was (going to feel). I really want to
get out, but I think that discretion is the better part
of valor, here." John adds, "Man, it's really
tempting, though. It really looks nice out
there." By the early 1990s, Charlie had changed
his mind. He said he was so pumped up with
adrenalin and enthusiasm, that "I had a tough time
getting to sleep." The Apollo 17 crew decided to
do an EVA after landing, planning to wake up in lunar
orbit at 105 hour 45 minutes and, after landing and
doing an EVA, starting their first lunar surface rest
period at about 128 hours, after a bit more than a
22-hour day, similar to what the Apollo 16 crew had
planned. Except for some timing differences,
that's what they did.
||CapCom gives them some
Surface Checklist changes including wake-up at 115:53
and suit donning at 117:03.
||CapCom tells them they
will see an RCS warning light at about 108 hours, which
is when they should be starting to sleep. They
should do a reset. And, then, just before they
wake up, they will get a different warning and will need
to change a control setting. John complains that
they're going to have to wake up at least twice and
wants to know, "How much sleep from the time when we
start to bed do you want us to get?" He is told
||Charlie is disappointed
that the surgeons will monitor him. Discusses the
problems the cable biomed cable caused in trying to get
||Charlie comments about
the light leaking into the cabin. CapCom Tony
England wishes them a good night a couple of minutes
later. However, three minutes after that, Charlie
wants to share an observation about the thickness of the
soil he will drill into during EVA-1. John calls
Houston at 108:00 to say that the warning light had come
First Lunar Surface Rest Period
||Charlie calls Houston to
confirm that an alarm he's just heard is the second one
Houston was expecting. Comments about the shock of
the noise and that he "almost jumped out of my
skin". Comments about sleeping in the
hammock. The only problem with getting to sleep
was "to get your mind in idle."
||The Public Affairs
commentator gives the press start time for what are
hoped to be three 7-hour EVAs: EVA-1 start,
119:28; EVA-2 start, 141:43; EVA-3 start, 165:30; and
liftoff at 177:28, which nearly six hours later then the
original time of 171:45.
||Charlie calls Houston and
tells them, "We're up." Charlie was awakened by a
burst of static in the earpiece, "and that's why I
pegged out the EKG about 20 minutes ago."
(Confirmed to CapCom by the Surgeon.) During the
post-flight debrief, John mentioned that the suits piled
on the engine cover "were up into the hammock about
three inches"and the support under his back made it feel
like he was "sleeping on a bed". Charlie took a
Seconal tablet before each of the first two rest periods
to help him overcome his excitement.. John said he
was 'warm' at the start of the rest period, took
everything off and "slept in the sleeping bag with
nothing on. I woke up in the middle of the night
and my feet were freezing. So I turned around (putting
his feet toward the back of the cabin) and put the ISA
(Interim Stowage Assembly, a set of cloth bags) over my
feet and went right back to sleep. Worked like a
charm. But the next couple of nights, I slept in
the LCG (Liquid Cooled Garment, but without water flow)
because it was really cold at night." Charlie
agreed that they needed to wear the LCGs and use the
sleeping bags, because it was "chilly at night".
He, too, didn't use the bag when he first went to sleep,
but used it later after he cooled down. Because of
the 6 hour landing delay, they needed to conserve
battery power, so Houston had them power down more
equipment than would have normally been the case.
This may have contributed to the cool conditions.
||Charlie reports that he
slept 6 1/2 to 7 hours and that, John "was sleeping so
great that I just woke him up just a second ago
... I couldn't stand it any longer (and wanted to
get him up and get going)." John slept 7 1/2 hours.
||CapCom reads up some
checklist updates. The rest period after EVA-1
will start at 130:15 and is scheduled to last 8
hours. "Tomorrow is pretty relaxed; we encourage
you to get a lot of sleep tonight. You've got plenty of
time; no need to feel like you've got to press (meaning
'hurry') in the morning."
||Deke Slayton tells them
that EVA-2 will be seven hours, EVA-3 five hours, launch
and rendezvous after EVA-3, but postpone the LM jettison
till after a rest period so they'll only have an
18-hour work day. Re-iterates that Houston wants them to
get a good sleep before EVA-2
||The Surgeon wants to
watch Charlie's biomed during the rest period.
John says he is going to wear the earpiece: "I'm going
to get Charlie some good sleep." Charlie says,
"Couldn't ever believe we'd go to sleep (because of the
excitement of being on the Moon), Deke; but, man,
this guy John sleeps like a baby up here. I've
never seen it." Although they are slightly behind
schedule, Deke reads up some checklist changes to save
time in the morning.
||They are about to
configure the Environmental Control System (ECS) for
Second Lunar Surface Rest Period
||John calls to ask "What
time are we supposed to get up?" CapCom says they
are 3 1/2 minutes early. Fifteen minutes later,
before giving his estimate of how much sleep he got,
Charlie asks Houston how much the surgeons think he
got. The surgeons say six hours; Charlie says his
estimate was 7 hours. John got 7 1/4 hours.
Charlie provides a description of the sleeping bag,
which he had to use when he got cold in the middle of
||About eight minutes after
what was to have been the final 'good night', John calls
to ask if they can change the Alignment Optical
Telescope (AOT) pointing because they've got sunlight
streaming in. Houston tells them to put it in any
position that solves the problem. Comments follow
about sleepwear, the urine collection system,
noise. No problems.
||Late in EVA-2, during the
drive back to the LM, Charlie asks in they still have
adequate supplies of consumables: oxygen, cooling water,
and PLSS battery power. CapCom tells them they
have enough "to go on a long time; We just feel
you've put in a good day." John says "Well, why
don't we stay out here and set a new world's outdoor
record?", meaning that he wants to take the record for
the longest lunar EVA away from the Apollo 15
crew." CapCom replies that they should leave
something for Apollo 17 and that, "We're going to set a
new sleep record."
||John and Charlie ask for
a ten-minute extension, still eager to to have the
longest EVA. The Flight Director understands their
interest but is reluctant, with the surgeon telling the
Flight Director that he doesn't want to shorten the
sleep period. At 149:00:00, Charlie begs for an
extension. It is granted.
||After EVA-2, Houston
tells them "we're not pushing, John, but we would like
to stay fairly close to the timeline so you can get
plenty of sleep tonight. You're going to have a
hard day tomorrow." An hour and a half later, CapCom
tells them that the rest period is to begin at 154:35
and will last 8 hours.
||In 1996, EVA CapCom Tony
England provided some comments about making sure that he
had adequate rest during the mission. On the J
missions, the EVA Capcoms were on duty well before the
EVA started and, in Tony's case, virtually until the
start of the rest period.
||Tony apologizes to John
and Charlie about letting them get behind in the
EVA. A late end to the EVA means a late start to
the rest period and, because everyone appreciates how
important adequate rest is in the long missions, a late
start to the rest period means a short final EVA.
||Last comm before the rest
period. John says they are about 1/2 hour
away from getting in the hammocks. The surgeons
will be looking at John's biomed data.
Third Lunar Surface Rest Period
||Charlie responds to the
wake-up call sounding like he's emerging from deep
sleep. Today, it's John's turn to ask the surgeons
how long they thought he slept. 6 1/2 to 7
hours. John was going to say 7.
||Back in the LM after
EVA-3, while John and Charlie have a meal, CapCom gives
them some checklist changes for post-docking. They
will defer some of the transfer of samples and other
items till after they have some sleep. Jim says
they've got water and electricity for another 18 hours
on the Moon and, jokingly, asks if they'd like to do a
fourth EVA. Charlie replies "If you'd let me
sleep, I wouldn't mind."
Sleep Notes from the Apollo 17 Lunar Surface Journal
confirming with Houston that the Surgeons will be
monitoring Jack, Gene asks permission to remove his
sensors for the first rest period. "The sensors itched,
and it was just generally irritating to have them
on. We had learned to put them on ourselves, so
that we could take them off when we could." The
Apollo 15 crew fought pre-flight to get approval and
training for sensor removal and re-application.
See discussion in the A15LSJ at 109:58:36,
||CapCom Joe Allen asks if
they'd like a 30-minute extension of the rest period
(from 7 1/2 to 8 hours). Cernan replies, "Yeah,
I'd like to try to get the full amount (of sleep).
As I recall, tomorrow's a little bit flexible. If
we get out 30 minutes late, it doesn't really hurt
||Discussion of sleepwear
and sleeping bags. In January 2004, they disagreed
as to whether they wore the LCGs or the CWGs and whether
they did or did not have sleeping bags. The Apollo
15 and 16 LM crews used sleeping bags. Their LM stowage list shows two "sleep
restraint assemblies", each weighing 2.3 pounds. The
Apollo 17 LM stowage list shows the same items
with the same weights, suggesting that Gene and Jack did
have sleeping bags, whether or not they chose to use
||Gene said in the early
1990s that "sleeping on the Moon is the greatest waste
of time a human being can conceive" meaning that they
were on the Moon for only 72 hours and slept for 24 of
those. "But you had to sleep; we were just so tired that
we didn't have any choice but to sleep."
Discussion of the decision to do the EVA before the rest
period, rather than the other way around. Comments
from Jack about the necessity of sleep, about doing the
EVA first, and about getting better sleep on the Moon
than in orbit and, in some ways, than on Earth.
First Lunar Surface Rest Period
||Jack was connected to
comm through the rest period and was only awakened once
by comm noise.
||Jack describes the
forearm fatigue he experienced during EVA-1 and the fact
that there was no residual soreness after the rest
there had been more efficient removal of lactic
acid and other metabolic products in 1/6th gravity than
||At the end of the EVA
debriefing, Jack wants to continue; but CapCom Joe Allen
indicates they should finish eating and get ready for
sleep. Making allowances for some padding in the
timeline, they are about an hour behind. Gene
tells Joe "We're working as fast as we can. Best
place in the world to make it up is tomorrow night.",
meaning that he doesn't want to cut EVA-3 short and
would rather have a short second rest period, a full
EVA, and catch up on sleep during the final rest period
before LM launch. More discussion about the need
||Fatigue can be heard in
Gene's voice. He and Jack have been awake since
136:55:05 and, in those 14 3/4 hours, have been very
active. Last comm at 152:24:15,
followed by more comments about sleep.
|Second Lunar Surface Rest Period|
||Gene wakes up sounding
groggy. Comments about the difference between the
first day and the third, physically and
psychologically. Houston wants them stay on the
timeline. They are an hour behind. That
isn't a problem, but they shouldn't get an farther
behind. they will actually gain back about 8
minutes in a smooth EVA prep. Jack had six good
hours of sleep. Gene had 3 hours good and 3
intermittent. He'd taken a Seconal sleeping
||Last comm before the
third rest period.
|Third Lunar Rest Period|
||Jack was awakened during
the night by some comm noise and got himself back to
sleep by composing a variation on "The Night before
Christmas" suitable to Apollo 17. He gave a
rendition after wake-up.
||Gene got 5 hours of good
sleep; Jack got "my usual 6". Neither took any