Most people picture astronauts floating weightlessly through gleaming corridors, and that image is accurate enough during the waking hours. Sleep, though, is a different matter. When the lights go ...

An odd thing happens to astronauts as they zip around the Earth at roughly 17,500 miles per hour: They don’t get enough sleep. This may be partly because astronauts don’t have to wake up early to see ...

A new review argues that sleep loss and circadian misalignment in spaceflight are multicausal operational hazards requiring ...