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:max_bytes(150000):strip_icc()/the-four-stages-of-sleep-2795920_FINAL-5c05c2fc46e0fb00018dac3d.png "4 Stages of Sleep: NREM, REM, and the Sleep Cycle")
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![Sleep Stages [4 Types of Sleep Stages] | SleepScore](https://www.sleepscore.com/wp-content/uploads/2020/10/sleepscore-blog-3_graphic-2-1024x871.jpg "Sleep Stages [4 Types of Sleep Stages] | SleepScore")