REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

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

A new study reveals that not getting enough of specific stages in the sleep cycle may be linked to cognitive decline and ...

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

Waking up after eight hours of sleep should feel refreshing. Yet, many people open their eyes feeling just as exhausted as when they went to bed. It's ...

Need another reason to prioritize your sleep? Not spending enough time in the two deep stages of sleep may hasten the ...

New research shows that reduced time in slow wave and REM sleep is associated with smaller brain volumes in regions ...

A link has been found between neuroactivity during sleep and brain atrophy in areas vulnerable to the degenerative disease.