How Sleep Works - Sleep Phases and Stages | NHLBI, NIH
https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep
WEBMar 24, 2022 · Non-REM sleep has three stages, defined by measurements of brain activity taken in sleep studies. Stage 1. This stage is the transition between wakefulness and sleep. Stage 2. When you reach stage 2, you are asleep. Stage 3. This stage is called deep sleep or slow-wave sleep, after a particular pattern that appears in measurements …
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