Friday Factoid: Hallucinations and Sleep

Katelyn Yunes, MS

WKPIC Doctoral Intern


Did you know that nonpathological hallucinations exist? Hypnagogic hallucinations are short-lived perceptual experiences that can occur while falling asleep. Similarly, hypnopompic hallucinations are short-lived perceptual experiences that can occur upon waking up and are often a continuation of a dream (Waters et al., 2016). Ohayon et al. (2016) found that both hypnopompic and hypnogogic hallucinations were common among a sample of United Kingdom citizens, with increased hypnopompic hallucinations in individuals with narcolepsy.



Ohayon, M., Priest, R., Caulet, M., & Guilleminault, C. (1996). Hypnagogic and hypnopompic hallucinations: Pathological phenomena? British Journal of Psychiatry, 169, 459–467.


Waters, F., Blom, J., Dang-Vu, T., Cheyne, A., Alderson-Day, B., Woodruff, P., & Collerton, D. (n.d.). What Is the link between hallucinations, dreams, and hypnagogic–hypnopompic experiences? Schizophrenia Bulletin, 42(5), 1098–1109.

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