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When Do Nightmares Occur?
Dreams and nightmares occur during REM (rapid eye movement) sleep. Sleep is categorized into REM and non-REM stages, with most people experiencing four to five sleep cycles each night. Each cycle lasts for 90 to 100 minutes. REM sleep occurs more frequently during the second half of the night; as such, nightmares occur most commonly at this time.
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Nightmares - Causes
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