Humans adapt. We live in trackless deserts, on the tops of mountains, in pestilential jungles, in prisons and hospitals. To survive we sleep, for we need sleep like food. We adapt to sleeping in space ...

Sleep deficiency is pervasive among astronauts before and during space flight, and the reported incidence of sleep-promoting medication use is 20 times greater than the proportion of Americans ...

Going to space is hard on the human body for a number of reasons. The microgravity environment causes muscle and bone loss and leads to fluids pooling in the upper parts of the body. Being in space ...

Astronauts have been adjusting to the challenges of sleeping in space for years — and the lessons learned from their zero gravity slumbers will ensure that one day the first crewed missions to Mars ...

An astronaut's eyes can change during spaceflights that last six months or more. That could be a problem for future planned missions. After decades of research, scientists may have a seemingly ...