parasomnia non-rapid eye movement-related parasomnia http://purl.obolibrary.org/obo/HP_0025235 http://purl.obolibrary.org/obo/NBO_0000499 A type of parasomnia that occurs during NREM sleep. NREM parasomnia NREM parasomnias usually occur within a few hours after sleep onset, episodes last from a few minutes to as long as 30-40 min, and are characterised by amnesia for the event. A parasomnia that occurs in non-rapid eye movement (NREM) sleep. This refers to a disorder of arousal that occurs during slow-wave sleep (ie, NREM stage 3 sleep). NREM sleep parasomnia NREM-related parasomnia non-rapid eye movement parasomnia non-rapid eye movement-related parasomnias