Basically different regions of some people’s brains can wake up separately from one another. “Sleep paralysis” happens when the conscious parts of the brain wake up while the parts that control motor functions haven’t. “Sleepwalking” is the opposite of this, when the motor functions of the body are awake but the conscious mind isn’t and “Night Terrors” are in the same family of sleep disorder in which the conscious and/or motor functions of the brain are “plugged in” but there is still active dreaming in progress. Night terrors during sleep paralysis are particularly traumatizing to the dreamer while night terrors during a sleepwalking episode can be positively dangerous to the people near the dreamer, who may be completely unaware of their actions.
None of these things really serve a purpose in and of themselves to the human body rather they are indicative of more compartmentalized minds, which can serve a purpose.
Every night when you go to sleep, your body paralyzes itself so you don’t act out your dreams and hurt yourself — assuming you don’t have a sleep disorder, this is why sleepwalkers exist. Sometimes, your mind wakes up earlier than your body expects, so it’s still paralyzed. You might “hallucinate,” but that’s basically your brain continuing to dream even though you’re awake.
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