Astronauts on the International Space Station (ISS) have to find creative ways to sleep in zero gravity.
American astronaut Sunita Williams took us on a tour, showcasing the individual sleeping cabins where astronauts catch some Zs.
Each cabin has a sleeping bag to keep astronauts from floating around and includes amenities like a computer and books.
Williams explains that astronauts don't feel upside down in space, so they can sleep in any orientation they like.
