Shop Health Coaching Classes Editor's Picks This ad is displayed using third party content and we do not control its accessibility features. As you snooze, you'll repeatedly cycle through four stages of sleep , each of which is linked with specific brain waves and neuron activity. The first three stages are non-REM sleep, and the final stage is REM sleep, which first occurs roughly 90 to 120 minutes after you first fall asleep, says Nishi Bhopal, MD , a board-certified integrative psychiatrist and sleep specialist.

https://www.mindbodygreen.com/articles/how-much-rem-sleep-do-you-need

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