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 published in the Journal of Sleep Research offers insight into how disrupted sleep and nightmares are related.

(To truly know your sleep stages would require a sleep study with ... Your body is beginning to relax, and your brain waves start to look different than they do when you’re awake.

Why are short naps better? "We want you to stay in the lighter stages of sleep when you nap," says Dasgupta. Napping for 20 minutes allows the body to rest without entering the deeper sleep stages.

Advancements in neuroimaging have allowed scientists to observe what happens in the brain during different stages of sleep. One consistent finding is that people with higher levels of sleep ...

New Study Links Lower Proportions of Certain Sleep Stages to Brain Changes Associated With Alzheimer's Disease Mar. 31, 2025 — New research reveals that lower proportions of specific sleep ...

Need another reason to prioritize your sleep? 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 ...

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Healthy sleep includes multiple components, such as number of hours of sleep per night, how long it takes to fall asleep, daytime functioning and self-reported sleep satisfaction, and addressing these ...