Sleep does more than fight fatigue. Doctors explain how a chronic lack of sleep weakens immunity, affects vaccine response, ...

Getting enough sleep is about more than feeling rested. New research suggests it may be one of the most important factors in ...

Where health, longevity, and cognitive ability are concerned, here’s how to know you get the right amount of sleep.

Consequently, we humans, as well as all other organisms, developed a circadian rhythm in our physiology and behaviors with ...

If you’ve ever suffered a night of poor sleep—like, you got about three hours less than you wanted—you may have found yourself in a doom spiral, thinking that you’ll never sleep well again (been there ...

For better sleep, many of us turn to sleep-tracking apps, therapeutic techniques or medications and supplements like sleeping pills or melatonin. But sometimes the solution comes down to nothing more ...

The following story is excerpted from TIME’s special edition, The Science of Sleep, which is available at Amazon. Anyone who has nodded off on the subway, faked alertness in a meeting at work or ...

The more sleep-deprived you are, the less you notice it. Here's what that paradox is potentially costing leaders at the ...