There could be cognitive benefits to a quick, 15- to 20-minute couch nap when you hit your 3 p.m. slump. There are different ...

Feeling tired despite enough hours? Learn how understanding your 90-minute sleep cycles & using a sleep calculator can help ...

Sleep also enables the body to repair and replenish cellular material that is damaged or depleted. Important bodily functions ...

Sleep needs vary from person to person, and while a lucky few can thrive on less, most of us need seven to nine hours a night ...

It makes up less than 3% of your nightly sleep cycles. Stage 2 is where light sleep gets to work. When you are fully asleep, your brain activity slows but has bursts of electrical activity.

A new study has revealed how often the snooze button is deployed, and how long for. So we've spoken to an expert to see how ...

You’ll typically complete 4 to 6 cycles per night. The first 3 stages, part of the first phase, are called non-REM sleep (N1 through N3). The final stage and second phase is REM. Stage N1 is the ...

Discover how just 3 nights of poor sleep can permanently damage heart health by triggering inflammation and cardiovascular ...

A sleep cycle is made up of four main stages: REM, and NREM1, 2 and 3. How long you spend in each stage, how quickly you transition between stages, and how many complete sleep cycles you ...

spending 25% of it in stage 3 would mean you spend about 2 hours in deep sleep. Each time you go to sleep, you start a new sleep cycle that goes from non-REM stages to a REM stage. The REM stage ...