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2. 10 Tips to Increase REM Sleep Naturally - AOL

   www.aol.com/lifestyle/10-tips-increase-rem-sleep...

   Each sleep cycle lasts about 90 to 110 minutes and includes stages that fall into two main phases: non-REM (or NREM) sleep and REM sleep. Non-REM sleep has three sub-stages: light sleep, deep ...

3. How can you get more REM sleep? Here's what experts say. - AOL

   www.aol.com/lifestyle/more-rem-sleep-heres...

   No, these are two different sleep stages. Deep sleep happens in stage 3, while REM sleep occurs in stage 4. Deep sleep is more restorative, while REM sleep plays an important role in brain ...

4. Rapid eye movement sleep - Wikipedia

   en.wikipedia.org/wiki/Rapid_eye_movement_sleep

   Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. The core body and brain temperatures increase during REM sleep and skin ...

5. Slow-wave sleep - Wikipedia

   en.wikipedia.org/wiki/Slow-wave_sleep

   Slow-wave sleep (SWS), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves. [ 2 ] Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. [ 3 ]

6. Sleep cycle - Wikipedia

   en.wikipedia.org/wiki/Sleep_cycle

   Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and ...

7. What Is Deep Sleep? Understanding the 4 Sleep Cycles & Why ...

   www.aol.com/deep-sleep-understanding-4-sleep...

   Known as slow-wave sleep or stage 3 non-REM sleep, this is the deepest stage of sleep and the hardest to wake up from. Brain activity slows down, muscles and bones strengthen, hormones regulate ...

8. Non-rapid eye movement sleep - Wikipedia

   en.wikipedia.org/wiki/Non-rapid_eye_movement_sleep

   Stage 3 – previously divided into stages 3 and 4, is deep sleep, slow-wave sleep (SWS). Stage 3 was formerly the transition between stage 2 and stage 4 where delta waves, associated with "deep" sleep, began to occur, while delta waves dominated in stage 4. In 2007, these were combined into just stage 3 for all of deep sleep. [7]

9. Taking Naps During The Day Will Actually Harm Your Deep Sleep ...

   www.aol.com/taking-naps-during-day-actually...

   Deep sleep is the third stage of NREM sleep, when the brain’s electrical activity slows down and settles into a harmonized rhythm, says Colin Espie, PhD, a professor of sleep medicine in the ...