Most nights, I am visited by nightmares. They range from “being chased by a crazed murderer” to “being swallowed by a tsunami” to “I’m late for a test in a class I didn’t know I have” to “It’s been a mistake, my mom/dad/cat didn’t actually die.” I wake up feeling sad, depressed, scared, and unrested. And so I wondered: What causes nightmares?

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