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The Five Stages of Sleep

  • February 4, 2015
  • By KIDS DISCOVER

Humans go through five sleep stages: 1 through 4, and REM (Rapid Eye Movement, when most dreams happen). But we cycle through them more than once a night, spending about 20 percent in REM and 50 percent in Stage 2, when eye movements stop and brain waves slow down. (CroMary / Shutterstock)

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