The average adult needs around four to six hours of core sleep every night to hit the most vital stages of rest and protect ...

Researchers have found that non-REM sleep actually helps strengthen memories, while REM sleep cleans them up and prevents ...

A new study suggested that not getting enough REM sleep can be an early warning sign of Alzheimer's disease. Here's what a ...

Sleep and brain experts respond to new findings on the association between REM sleep and Alzheimer's disease, recommending ...

However, some research suggests that poor sleep could raise your risk of Alzheimer’s. A study published in November found ...

A new study has explored a potential link between a particular sleep pattern and the risk of Alzheimer’s disease ...

Rapid eye movement sleep is important as it stimulates an area of your brain known as the amygdala. It’s associated with learning, emotional processing, dream content and memory consolidation.

These stages are awake, non-REM sleep (NRM) 1, NRM 2, NRM 3 (or deep sleep), and REM (or rapid eye movement sleep). As for how much time we need to be in each type?

Any sleep tracker will show you that slumber is far from a passive affair. And no stage of sleep demonstrates that better than rapid eye movement, or REM, commonly called dream sleep.

So let’s break it down. On an Apple Watch, "core sleep" is another name for light sleep, which scientists also call stages N1-N2. It is not a type of deep sleep, and has no relation to REM.

REM sleep behavior disorder can occur at any age, but symptoms usually start with people in their 40s and 50s. For those younger than 40, antidepressants are the most common cause of REM sleep ...

During REM, by contrast, the brain displays bursts of electrical activity that are reminiscent of waking. Even across mammals, REM sleep doesn’t all look the same.