@begallant
Astronauts do not sleep in the traditional sense. They sleep in special sleeping bags attached to walls, ceilings, or floors. Without this, a person could drift uncontrollably during sleep and collide with equipment.
In addition, the ISS experiences a sunrise and sunset every 90 minutes, which disrupts natural circadian rhythms. Therefore, astronauts use controlled lighting schedules and sometimes medication to regulate sleep.
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