Neurological origins of sleep paralysis
Sleep paralysis often occurs when we take a nap, when jet-lagged or sleep-deprived. We wake up while still in the stage where vivid dreams occur, called the rapid eye movement sleep (REM).
During REM, the front brain - central to our ability to plan and think logically - turns off and makes our bodies temporarily paralyzed. It prevents us from acting out "real" dreams. Sometimes we wake up in this stage. The vivid and sometimes threatening dreaming of REM can "spill over" into conscious awakening. It can feel like a nightmare coming alive.
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Sleep paralysis
We are paralyzed during REM sleep, and we believe that this is so we don’t act out our dreams.
A small percentage of the population wake up in REM sleep, but the brain forgets to wake the muscles so they get this scary state where they are paralyzed but awake.
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