In the stillness of the night, when the body should lie calm in sleep, something else may be happening beneath the surface. For some people, the dreaming mind turns the body into a stage for sudden ...

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. But in the sc ...

Reduced slow wave and REM sleep are linked to smaller brain volumes in Alzheimer’s-vulnerable regions Polysomnography and imaging reveal that poor sleep in midlife may raise long-term Alzheimer ...

Scientists have long noted eerie parallels between psychedelic trips and rapid eye movement (REM) sleep, the stage during which you dream. Some even suggest psychedelics could induce a “waking ...

Many people think of Parkinson's disease (PD) as a movement condition that causes people to shake their hands, move slowly, ...

Polysomnography coupled with nocturnal penile tumescence recording confirmed this diagnosis, documenting recurrent awakenings, mostly after REM sleep, accompanied by painful erections. Painless ...

As we sleep, our brain moves through four stages and two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). The brain has four stages within the NREM phase. Each stage and phase of ...

Not spending enough time in the two deep stages of sleep — slow-wave and rapid eye movement, or REM, sleep — may hasten the deterioration of parts of the brain associated with Alzheimer’s ...