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Sleep-Related Hallucinations
Flavie Waters1, Ivan Ling2, Somayyeh Azimi3
1Clinical Research Centre, Graylands Hospital, North Metropolitan Health Service Mental Health, Brockway Road, John XXIII Avenue, Mount Claremont, Perth, Western Australia 6009, Australia; School of Psychological Science, The University of Western Australia, Crawley, Western Australia, Australia.
Abstract:
The diagnostic category of sleep-related hallucinations (SRH) replaces the previous category of Terrifying Hypnagogic Hallucinations in the 2001 edition of International Classification of Sleep Disorders-R. Hypnagogic and hypnopompic hallucinations (HHH) that occur in the absence of other symptoms or disorder and, within the limits of normal sleep, are most likely non-pathological. By contrast, complex nocturnal visual hallucinations (CNVH) may reflect a dimension of psychopathology reflecting different combinations of etiologic influences. The identification and conceptualization of CNVH is relatively new, and more research is needed to clarify whether CNVH share common mechanisms with HHH.
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