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Related Experiment Videos

Isolated sleep paralysis elicited by sleep interruption.

T Takeuchi1, A Miyasita, Y Sasaki

  • 1Department of Psychology, Waseda University, Tokyo, Japan.

Sleep
|June 1, 1992
PubMed
Summary

Researchers induced isolated sleep paralysis (ISP) in healthy individuals by interrupting sleep, finding a strong link between ISP and sleep onset REM periods (SOREMPs). Polysomnograms revealed a unique REM/wake dissociated state during these episodes.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Psychology

Background:

  • Isolated sleep paralysis (ISP) is a sleep disorder characterized by temporary inability to move or speak during wakefulness.
  • Understanding the mechanisms and triggers of ISP is crucial for developing effective treatments.

Purpose of the Study:

  • To experimentally elicit isolated sleep paralysis (ISP) in normal subjects.
  • To investigate the relationship between ISP and sleep onset REM periods (SOREMPs).
  • To characterize the polysomnographic (PSG) and experiential features of elicited ISP.

Main Methods:

  • A nocturnal sleep interruption schedule was used to elicit ISP in 16 healthy subjects over four nights.
  • Sleep was interrupted 40 minutes after REM sleep termination, aiming to induce SOREMPs.

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  • Verbal reports and polysomnograms (PSG) were recorded during elicited ISP episodes.

    • Main Results:

    • The sleep interruption schedule successfully induced SOREMPs in 71.9% of attempts.
    • Six episodes of ISP were elicited (9.4%), with most occurring from SOREMPs, indicating a strong correlation.
    • ISP experiences included immobility, awareness of surroundings, hallucinations, and unpleasant emotions.
    • PSG recordings during ISP showed a REM/wake (W) stage dissociated state with alpha electroencephalograms and muscle atonia.

    Conclusions:

    • ISP can be experimentally induced in healthy individuals using a specific sleep interruption protocol.
    • ISP is closely associated with SOREMPs and characterized by a unique REM/W stage dissociation.
    • Elicited ISP differs from other sleep-related dissociated states and shares similarities with sleep paralysis in narcolepsy.