Medically reviewed by Sanja Jelic, MD As we sleep, our brain moves through four stages and two phases: non-rapid eye movement ...

In nonrapid eye movement (NREM), a state of cardiovascular relaxation ... ocular movements is concentrated in rapid eye movement (REM) sleep. During this phase, fluctuations in arterial pressure ...

People on TikTok and other social media say they feel more alert when they have had fewer hours of sleep—but sleep scientists ...

Humans and mice with a predisposition for ALS displayed altered sleep patterns before symptoms began, offering a potential ...

Yet stages 1 through 4 have been labeled as non-REM sleep, or NREM—80 percent of sleep is defined by what it’s not. Sleep scientists speculate that specific sequences of NREM and REM sleep ...

Oxygen re-saturation during sleep is significantly affected by sleep stage and by cardiovascular and pulmonary comorbidities.

But following a night of sleep, the sequence becomes unitized ... effective integration of these memories probably takes several NREM–REM cycles or multiple nights before optimal representations ...

Your brain prevents reflexes in NREM sleep and muscle movements in REM sleep, so you can't sneeze. Checking for mold, using an air purifier, and keeping pets off your bed may improve night sneezing.