What Is REM Sleep?

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By somerset
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Reviewed: dr. vanta
Article Sources Article Sources
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Medical Expert Medical Expert

2. Sleep Stages 1 & 2

In adults, sleep occurs in 90 to 110-minute cycles, with each cycle containing three non-REM stages and one stage of REM sleep. Stage 1, known as light sleep, only lasts around 1 to 5 minutes. When woken up during this stage, people typically are unaware they were asleep, and it's usually quite easy to wake them.

Stage 2 lasts for 25 minutes to an hour, increasing in length as more cycles pass over the course of a night. It's harder to wake people up during this stage.4‘Stages of Sleep.’ Sleep Foundation, www.sleepfoundation.org/how-sleep-works/stages-of-sleep.

REM Sleep

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