How do you sleep in zero grav­ity?

World of Knowledge (Australia) - - History -

The crew on the In­ter­na­tional Space Sta­tion (ISS) kip in sleep­ing bags at­tached to the wall with Vel­cro or ca­bles. On av­er­age, crew mem­bers get six hours of sleep a night, but as there is no ‘up’ or ‘down’ in weight­less con­di­tions, many suf­fer from sleep dis­or­ders. These are made worse by the fact that the ISS ex­pe­ri­ences 16 sun­rises and sun­sets ev­ery 24 hours. This fre­quent switch­ing be­tween day and night dis­turbs the pro­duc­tion of the hor­mone mela­tonin, which reg­u­lates our cir­ca­dian rhythms. An­other cause of sleep de­pri­va­tion are so­lar light­ning strikes, which the as­tro­nauts can still see with their eyes closed.

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