The weird and wonderful world of sleeping in space — and what studies of astronauts tell us about the future of sleep ...

Astronauts sleep tethered to avoid floating and injuring themselves. Spacecraft ventilation prevents carbon dioxide buildup near sleeping astronauts. Ear plugs and eye masks help astronauts sleep ...

If you're like a lot of people on Earth, sleeping can be a struggle. A lack of sleep can affect not only your cognitive abilities and overall health, but it can also throw your body's circadian rhythm ...