Make the most of your midday Zzzs.

The idea that you can gradually train your body to function optimally on less sleep has become a badge of honor in our productivity-obsessed culture, but this belief is based on a fundamental ...

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: ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." There are countless sleep hacks, supplements, and cozy pajamas that may elevate your sleep game, but that ...