Add Yahoo as a preferred source to see more of our stories on Google. A painting of a woman waking up. The wild thing about Ekirch's study was that the evidence of biphasic sleep was staring us in the ...

Stop blaming cortisol for your 3 a.m. wake-ups — what you do in the run-up to bed has a far bigger impact ...

Sleeping about an hour and 20 minutes less each night for six weeks caused participants to gain weight and spend more time inactive. Researchers found that even mild, realistic sleep loss, similar to ...

Eight hours of sleep used to be the norm, and all-nighters with only a few hours of rest were rare among teenagers. In recent years, however, there has been an alarming decline in sleep duration. It ...

New research suggests it’s extremely important.

The solution to your next sleepless night may be simpler than you think. A new study from McGill University just found a surprising way to protect your memory after a night without rest, and it ...

The study found that three switches could lead to a longer time spent in the deep, slow-wave sleep phase.

A new study suggests that different stages of sleep can significantly affect the risk of developing dozens of diseases. Previous studies have shown that six to eight hours of sleep a night is ...