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: ...

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 ...

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

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 ...

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 ...

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

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 ...