A sleep doctor breaks down how much deep sleep we need by age, plus the 6 signs you're not getting enough ...

This sleep stage is incredibly important.

Americans may not be so bleary-eyed after all. According to Withings, a maker of health tracking devices, Americans are falling asleep these days at 11:32PM and waking up at 7:22AM—nearly a solid ...

Is your sleep schedule all over the place? This is how your irregular sleep schedule is ruining your energy- ...

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 ...

How does your brain know when it's time to sleep? There are two main factors: Hours Awake. The longer you've been awake, the stronger your drive for sleep. Circadian Rhythm. Your body operates on a ...

After years of dealing with smartwatches that tell me to sleep less because of inaccurate tracking, I found one that gets ...