Cocooned in sleeping bags and floating upside down, the Artemis II crew reported having some of the best sleeps of their ...

In microgravity, there is no real sense of up or down. Without gravity pulling the body toward a mattress, astronauts can sleep in nearly any orientation — sideways, upright, or upside down.

Russian astronaut Vasily Tsibliyev hadn’t had a good night’s sleep for 12 days. He was being kept awake on purpose, as part of a study about sleeping on board the space station Mir. On the 13th day, ...

Artemis II astronauts sleep “like a bat” or wherever they can fit themselves comfortably in their crammed spacecraft quarters as they hurtle through space towards the moon, NASA mission commander Reid ...