Transcription: Depending on the size of the crew, sleeping arrangements vary with each orbiter and mission. One arrangement consists of a tier of three horizontal bunks with an additional fourth bunk in the vertical position. The fourth person can sleep in a standing position upside down or right side up since there is no difference of feeling at zero gravity. The beds are padded boards with a modified fireproof sleeping bag attached so that the astronauts strap themselves in during their normal eight hour sleep cycle. Eye shades and ear plugs are used to minimize the ever-present activity of the cabin. If a ...
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