Space
There is no up or down. No sunrise or sunset you can trust. Your body has no idea what time it is.
Astronauts sleep in small pods or tethered sleeping bags, using scheduled lighting, eye masks, ventilation, and routine to compensate for microgravity, noise, and 16 sunrises per day.
16 sunrises daily
The ISS orbits Earth roughly every 90 minutes.
Less sleep
Astronauts often sleep less and more poorly than on Earth.
CO2 can linger
In microgravity, exhaled air does not rise away naturally.
Noise never stops
Life support systems run continuously.
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