A sleeps exactly 7.5 hours every day. On nights when he works the night shift, he goes to bed at 1 a.m. and wakes up late in ...

Naps are short periods of sleep that occur outside a main nocturnal period that are differentiated from bouts of uncontrollable and unintended sleep. The latter may underlie significantly inadequate ...

Nature gave us sleep as the ultimate reset button, but how much people actually get varies widely by country. While sleep ...