Sleep Cycles: One rapid eye movement (REM) stage and three non-REM stages that altogether last about 90 to 120 minutes Benefits: Physical and mental recuperation and memory consolidation Disorders: ...

Going to bed at a sensible time takes serious self-discipline. If you’re anything like me, the moment your head hits the pillow tends to creep later and later as the week goes on — often thanks to a ...

I'm not 'catching up' on sleep, I'm ruining the next week ...