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www.nasa.gov/.../5-8/features/F_Sleeping_in_Space.html

But it's a little different in space. In space there is no up or down, and you do not feel the pull of gravity. As a result, astronauts are weightless and can sleep anywhere. Astronauts can attach themselves to a wall, a seat or a bunk bed inside the crew cabin so they don't float around and bump into something.

science.howstuffworks.com/sleep-in-space1.htm

Most astronauts choose to sleep as closely to how they would on Earth, in sleeping bags tethered to the floor, the walls, or the ceiling. In the microgravity environment there is no such thing as "up," which means it's just as easy to sleep vertically as you would horizontally back home.

www.esa.int/kids/en/learn/Life_in_Space/Living_in_space/...

After a long day working in orbit, there is nothing like a good night’s sleep! However, sleeping is a little different in space. There is no up or down, and everything is weightless. Astronauts can attach their sleeping bags to a wall or a ceiling, and sleep anywhere as long as they don’t float around and bump into something.

spaceflight.nasa.gov/living/spacesleep/index.html

Generally, astronauts are scheduled for eight hours of sleep at the end of each mission day. Like on Earth, though, they may wake up in the middle of their sleep period to use the toilet, or stay up late and look out the window.

blog.sleepnumber.com/how-do-astronauts-sleep-in-space

Fred Haise didn’t sleep much on his ill-fated Apollo lunar journey. Haise was to be the sixth astronaut to walk on the moon when he launched into space on the Apollo 13 lunar module in 1970. But almost 56 hours into the flight, both oxygen tanks blew and the spacecraft lost electricity, light and…

www.space.com/35293-how-astronauts-sleep-in-space.html

Astronauts at the International Space Station have the option of taking melatonin, a supplement that regulates sleep. Melatonin, a naturally produced hormone in the human body, is a popular over ...

www.answers.com/Q/How_do_astronauts_sleep

astronauts sleep in sleeping bags tied up to the ceiling and the floor so they wont move around so much Astronauts sleep in sleeping bags. The bags are fixed to the wall inside a spacecraft.

www.sleep.org/articles/how-astronauts-sleep

Still, astronauts average two hours less sleep than they do at home, and more than 75 percent of astronauts report using sleeping pills. That’s why NASA is constantly researching ways to improve their sleep, such as having astronauts at home and in space wear watches that track their sleep patterns.

en.wikipedia.org/wiki/Sleep_in_space

Research suggests that astronauts' quality and quantity of sleep while in space is markedly reduced than while on Earth. The use of sleep-inducing medication could be indicative of poor sleep due to disturbances. A study in 1997 showed that sleep structure as well as the restorative component of sleep may be disrupted while in space.