Staying up all night is doing more damage than you might think

Rafi Letzter/Tech Insider The average adult requires between seven and eight hours of sleep a night, according to the National Institute of Health.  So it's no surprise that staying awake all night isn't healthy, but there's more to it than that. An all-nighter actually alters the type of sleep our brains get. Traditionally, sleep starts with a period of non-REM (rapid eye movement) sleep that consists of three phases: stages 1, 2, and 3. Of the three, stage 3 is the most important for reco...