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Sleep stages and circadian rhythms | Processing the Environment | MCAT | Khan Academy

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dreaming occurs in REM

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What a Good Night's Sleep Does for the Brain

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Parasominas occur in stage THREE

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muscle spasms occur in stage ONE

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REM stands for Rapid Eye Movement

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memory consolidation occurs in stage TWO

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arousals can occur in stage ONE and in REM sleep

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Sleep Spindles and K Complexes protect the brain from awakening