Psychology / Psych 0322 · Atom · ~20 seconds
REM Atonia
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REM atonia is the near-paralysis of voluntary muscles during REM sleep that prevents dreams from being acted out.
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A sleeper dreaming of running lies still, with movement blocked below the level of the brainstem.
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Atonia sometimes persists briefly on waking. That experience is sleep paralysis, not a medical emergency.