Sleeping on the International Space Station is not easy. This flashlight for astronauts can help

We humans have enough trouble keeping our sleep schedules aligned with Earth’s sunrise and sunset, so one can only imagine what it must be like when you’re trying to get a good night’s rest on the International Space Station (ISS). Not only does the orbiting laboratory orbit our planet once every 90 minutes, which means the astronauts aboard witness 16 sunrises and sunsets each day, but the inhabitants of the planet are constantly experiencing weightlessness.

Astronauts on the International Space Station can’t lie completely flat on their beds. They sleep floating, tied to the wall.

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