The 4 stages of sleep: NREM, REM, and your sleep cycle
Learn about the 4 stages of sleep, how long each cycle is, and how much deep sleep you really need. Plus, what occurs during each stage, including REM and NREM.
Learn about the 4 stages of sleep, how long each cycle is, and how much deep sleep you really need. Plus, what occurs during each stage, including REM and NREM.