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

Deep sleep is the restorative stage of sleep. During this stage the body undergoes tissue repair, the immune system is ...

The quality of the sleep you get during each stage of your sleep cycle also plays a major role. Moving through the sleep cycle's four stages is essential for restorative sleep, since every stage ...

The key to getting good sleep is understanding how it works. But it's a complicated thing. And, while we usually hyperfocus on sleep duration, counting the hours of rest we get and assuming the ...

Sleep architecture refers to the sleep phases that the brain cycles through each night. These are the four phases of sleep: ...

(There was an older classification that split off the deepest sleep into its own stage, calling it non-REM stage 4, but currently ... the other stages, and we cycle through these stages all ...

I talked to two ob-gyns and two mental health experts to find out what happens to menstruating people’s bodies and minds ...

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

Dreams are a fascinating mystery – whether it was a terrifying nightmare or a vivid fantasy, most of us can still vividly recall at least one. Songs have been composed and scientific discoveries ...

While the verdict on its cause is not clear, Alzheimer's is thought to be caused by a combination of factors, including ...