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Related Experiment Videos

Hypnagogic and hypnopompic hallucinations: pathological phenomena?

M M Ohayon1, R G Priest, M Caulet

  • 1Centre de Recherche Philippe Pinel de Montréal, Québec, Canada.

The British Journal of Psychiatry : the Journal of Mental Science
|October 1, 1996
PubMed
Summary

Hypnagogic and hypnopompic hallucinations are surprisingly common in the general population, far more so than narcolepsy alone would suggest. Hypnopompic hallucinations may be a stronger indicator of narcolepsy, especially with daytime sleepiness.

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Psychiatry

Background:

  • Hypnagogic and hypnopompic hallucinations are recognized symptoms of narcolepsy.
  • Their prevalence in the general population remains largely uncharacterized.

Purpose of the Study:

  • To determine the prevalence of hypnagogic and hypnopompic hallucinations in a UK community sample.
  • To explore associations between these hallucinations and other sleep/mental health conditions.

Main Methods:

  • A telephone survey of 4972 individuals aged 15-100 in the UK.
  • Utilized a structured interview process guided by a computerized system.

Main Results:

  • 37% reported hypnagogic hallucinations; 12.5% reported hypnopompic hallucinations.

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  • Hallucinations were more frequent in individuals with insomnia, excessive daytime sleepiness, or mental disorders.
  • The study estimated narcolepsy prevalence in the UK at 0.04%.

    • Conclusions:

    • Hypnagogic and hypnopompic hallucinations are significantly more prevalent than previously thought and not solely explained by narcolepsy.
    • Hypnopompic hallucinations might serve as a more specific indicator for narcolepsy, particularly in individuals experiencing excessive daytime sleepiness.