One theory I read is that nightmares are simulations that our brain runs while our bodies are locked down.
Body: ok, I’m fully unconscious, won’t be moving much.
Brain: excellent, I’ll commence scenario 194729q – zombie attack in your elementary school with your high school friends working with you to rescue your college friends just in case it ever comes up.
Since we have memory fragments and ideas scattered in brain storage, the brain sometimes uses dreams to mush them together. When it’s dangerous or scary it’s a nightmare.
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