A terrifying kind of dream that occurs during REM sleep and whose content is exceptionally frightening or uncomfortable is called a(n)

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Nightmares are vividly realistic, disturbing dreams that rattle you awake from a deep sleep. They often set your heart pounding from fear and occur during REM sleep. Night terrors, on the other hand, happen during non-REM sleep and the person usually doesn't recall the episode.

A Terrifying Kind of Dream That Occurs During REM Sleep