Researchers have found that it isn't just the total sleeping time, but the amount of time spent in REM sleep, that is linked to a lower risk of over 80 diseases.

Deep sleep is concentrated in the early part of the night, while dream sleep is concentrated toward dawn. I didn't know this.

(Bymuratdeniz/E+/Getty Images) There's a lot more to sleep than just the amount of time that passes between you drifting off ...

The feeling of having had “a good night’s sleep” lies not only in how much we slept, but also in the subjective impression of having slept deeply and without interruption. But what constitutes the ...

Last night you probably slept for seven to eight hours. About one or two of these was likely in deep sleep, especially if you're young or physically active. That's because sleep changes with age and ...

Waking up from a vivid, emotionally-charged dream can feel disorienting and sometimes disturbing. But new research shows that intense dreams actually may give people the sense of having had more ...

Children's sleep troubles (such as night terrors and nightmares) are physiological phenomena that occur during the brain's ...

Sleep is a very fickle thing. Sometimes, you can log a full eight hours of sleep and still wake up groggy. Other times, you sleep much less and feel surprisingly refreshed. A new study suggests this ...

If you wake up during or just after a REM period, you are more likely to remember what you were dreaming. Most of the dreams one remembers are the ones they see with their eyes open. When asleep, most ...

Over the years, several theories have emerged within the scientific community as to why we have dreams, many of which ...

The longer you spend in a dream phase, the less likely you may be to develop conditions like Alzheimer’s and heart failure, a study suggests.