Sleep Cycles and the Stages of Sleep, Defined

There are four stages of sleep that make up a sleep cycle. Over the course of a night, your brain will transition through the various stages of sleep multiple times.

What Are The 4 Stages Of Sleep & What Does Each Stage Do?

Average Time in Each of the 4 Sleep Stages [+Chart Overview]

How Much Deep Sleep Do You Need? A Sleep Scientist Explains

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Learn How to Sleep Better by Understanding Sleep Cycles & Stages

REM sleep: Definition, functions, and the effects of alcohol

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Brain Basics: Understanding Sleep National Institute of Neurological Disorders and Stroke

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