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Relations among hypnagogic and hypnopompic experiences associated with sleep paralysis
J A Cheyne1, I R Newby-Clark, S D Rueffer
1Department of Psychology, University of Waterloo, Ontario, Canada. acheyne@watarts.uwaterloo.ca
Journal of Sleep Research
|January 26, 2000
Summary
Sleep paralysis affects nearly 30% of university students, often accompanied by vivid hallucinations. Fear and a sense of presence are linked to these sleep experiences, potentially triggering further hallucinations.
Area of Science:
- Psychology
- Sleep Medicine
- Neuroscience
Background:
- Sleep paralysis is a common phenomenon.
- Hypnagogic and hypnopompic hallucinations can occur during sleep transitions.
- The Waterloo Sleep Experiences Scale (WSES) was developed to measure these experiences.
Purpose of the Study:
- To assess the prevalence of sleep paralysis and associated hallucinatory experiences in university students.
- To investigate the relationship between fear, sensed presence, and hallucinatory phenomena.
- To explore the potential role of sensed presence and fear in the development of sleep paralysis-related hallucinations.
Main Methods:
- A survey of 870 university students using the Waterloo Sleep Experiences Scale.
- Statistical analysis including regression to examine associations between variables.
Main Results:
- Nearly 30% of students reported sleep paralysis.
- Approximately 75% of those with sleep paralysis also experienced hallucinations.
- Fear was positively associated with hallucinatory experiences, particularly sensed presence.
- Regression analyses supported the hypothesis that sensed presence and fear are linked to sleep paralysis and contribute to hallucinations.
Conclusions:
- Sleep paralysis and associated hallucinations are prevalent in university students.
- Sensed presence and fear appear to be fundamental components of sleep paralysis experiences.
- These factors may play a role in the development of more complex hallucinatory experiences during sleep paralysis.