SLEEPING SOUNDLY ON THE MOONAPOLLO 15.
Flown on Apollo 15, a lunar module hammock hook and strap, consisting of an alloy clip, approximately 3 inches long, with sprung 'jaw,' stitched onto a strap of 1-inch wide mid-brown nylon webbing. Faint serial number on back of clip, reading approximately "LDW-48519719-1."
VITAL PIECE OF EQUIPMENT TO ENSURE THE APOLLO 15 CREW PERFORMED AT FULL CAPACITY.
As DAVE SCOTT explains in his SIGNED provenance note, "Apollo 15 was the first lunar exploration mission during which the crew had to learn how to 'live' (rather than 'stay') on the Moon. Our expedition of three full days on the Moon was twice as long as previous missions and restful sleep was absolutely essential for us to perform at maximum capacity during each of three full days of intense EVA activities. During previous missions, the crew had only two brief rest periods during which they remained in their stiff and bulky spacesuits. However, to work for three long days, we decided that we needed to live as close to normal conditions as practical. Therefore, we planned our work-sleep cycles according to our normal circadian rhythm (i.e., on Houston time); and because we had high confidence in the Lunar Module systems, especially the cabin pressure integrity against the harsh lunar vacuum, we decided to remove our spacesuits at the end of each day and sleep in our constant wear garments (underwear). At the conclusion of each day's activities, we hooked hammocks to the LM bulkhead using two small hooks attached to beta cloth straps sewn into the hammocks (... on Apollo 15 the straps on the hook were brown). Because of the 1/6 G environment, we only weighed 30 pounds and sleep in the hammocks was sound and restful; we averaged about six hours a night. On the third morning, prior to stowing the hammocks I cut the hook/straps from my hammock and returned them to Earth as mementos of living for three days on the Moon."