Arousal parasomnia Recurrent distressing nightmares 2023-07-28T13:55:40Z Disturbing dreams Nightmare disorder Repeated occurrence of nightmares that cause clinically significant distress or impairment in social, occupational or other important areas of functioning, which are not attributable to the physiological effects of a substance (e.g. drug abuse or medication) and which cannot be adequately explained by coexisting mental and medical disorders. REM parasomnia