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

New science links poor sleep habits to severe long-term health risks. Five leading wellness experts break down the steps you ...

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

Stress and sleep are closely related. Stress raises cortisol levels, delays sleep, reduces sleep quality, and may increase the likelihood of nightmares. A lack of sleep can also affect day-to-day ...

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 ...

Blame it on the Industrial Revolution. Or maybe on the light bulb. But ever since man met machine, sleep has been on the skids. In 2001, 38 percent of U.S. adults said they were sleeping less than ...

From babies who cry through the night to teens who sleep all morning to older adults who just can’t seem to catch any z’s, sleep patterns and the amount of sleep you need change throughout our lives.

Christmas is supposed to be restful, yet somehow it ends up being one of the worst times of year for sleep. Between late nights, travel, one too many eggnogs and all that excitement, your sleep ...