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: ...

Sleep is one of life’s most universal behaviors. Despite its ubiquity, it’s also one of the most mysterious. Humans spend ...

Turns out jellyfish and sea anemones – among the ancient creatures with a nervous system instead of a brain – have a very similar sleeping routine to our own. A new study published in Nature ...

Study suggests sleep patterns shifted with modern-day habits. July 23, 2014— -- Though closing our eyes and drifting off into unconsciousness is one of the simplest tasks we perform each day, ...

On a special episode (first released on July 24th) of The Excerpt podcast: The question is: Why do we struggle to sleep? Jennifer Senior, a staff writer at The Atlantic, joins The Excerpt to talk ...

Sleep is a biological necessity, not a luxury, and getting 7–8 hours of consistent, high-quality night-time sleep is crucial ...

Add Yahoo as a preferred source to see more of our stories on Google. Six hours sleep For those of us who worry about our sleep, every morning is a scramble of mental maths as we turn to our bedside ...

When a person is asleep, their core body temperature drops. Heart rate and breathing also slow down and overall metabolic activity decreases by about 10%. A sleeping body may seem inactive at first ...