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Sleep in space
Sleeping in space requires that travelers sleep in a crew cabin, a small room about the size of a shower stall. They lie in a sleeping bag which is strapped to the wall.〔(【引用サイトリンク】title=A Day in the Life Aboard the International Space Station )〕 Astronauts have reported having nightmares, dreams, and snoring while sleeping in space.〔(NASA - Sleeping in Space )〕
Sleeping and crew accommodations need to be well ventilated; otherwise, astronauts can wake up oxygen-deprived and gasping for air, because a bubble of their own exhaled carbon dioxide had formed around their heads. Brain cells are extremely sensitive to a lack of oxygen and brain cells can start dying less than 5 minutes after their oxygen supply disappears;the result is that brain hypoxia can rapidly cause severe brain damage or even death.〔(Cerebral hypoxia )〕 A decrease of oxygen to the brain can can cause dementia and brain damage, as well as a host of other symptoms.〔(Dementia From Oxygen Deprivation )〕
In the early 21st century, crew on the ISS were said to average about six hours of sleep per day.〔(Astronaut set to make history for longest stay in space )〕
==See also==
*Mir#Sleeping in space
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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