title: REM and NREM nightmares.
mesh_terms: D001007:Anxiety; D001143:Arousal; D004325:Dreams; D005239:Fear; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D011603:Psychophysiology; D012890:Sleep; D012894:Sleep Stages; D012895:Sleep, REM