What is the strictly scheduled duration for sleep for astronauts aboard the ISS?

Answer

Approximately 8.5 hours

Sleep for ISS astronauts is strictly scheduled for roughly 8.5 hours, often commencing around 21:30 UTC, despite the constant visual stimulation from orbital motion.

What is the strictly scheduled duration for sleep for astronauts aboard the ISS?

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What ISS Astronauts Really Do In A Day

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