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There are 4 non-REM stages and REM sleep.

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There are 4 non-REM stages and REM sleep.

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There are five stages of sleep; Stages 1-4, and then REM (rapid eye movement) sleep, in which dreaming occurs.

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As of 2008, the American Society of Sleep Medicine combined the stages three and four. So now there are only 3 stages

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quiet sleep

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The deepest stage of sleep is REM or Rapid Eye Movement.

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