Manifestation of Sleep Paralysis among Clinical and Non-Clinical Population; A Comparative Study
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Abstract
Background: Sleep paralysis is a transient and often distressing condition characterized by an inability to move or speak during the transition between wakefulness and sleep. Previous studies have highlighted a higher prevalence of sleep paralysis in psychiatric populations compared to the general population, yet comprehensive comparative studies remain scarce. Understanding the nuances of sleep paralysis across different populations is crucial for developing targeted interventions.
Objective: This study aims to compare the manifestation of sleep paralysis among clinical (neurotic and psychotic disorders) and non-clinical populations, with a specific focus on the prevalence of intruder, incubus, and vestibular-motor experiences.
Methods: A comparative cross-sectional design was employed, with a sample size of 90 participants, equally divided among clinical (neurotic and psychotic) and non-clinical groups from Rawalpindi and Islamabad. The study utilized purposive sampling for participant selection. Individuals aged 14 years and above, diagnosed with neurotic disorders, brief psychotic disorder, early psychosis, or those experiencing sleep paralysis without a mental disorder diagnosis were included. The Waterloo Unusual Sleep Experiences Questionnaire-IX (WQ) along with diagnostic scales for depression, anxiety, panic attacks, and psychotic disorders were administered. Data analysis was conducted using IBM SPSS Statistics version 25, employing descriptive statistics, ANOVA, and Chi-Square tests.
Results: The mean age of participants was 22.21 (SD = 4.318). Gender distribution was 54.4% male and 45.6% female. The ANOVA results indicated no significant differences in the intruder and incubus experiences across groups. However, a significant difference was found in the intensity and frequency of vestibular-motor experiences, with F values of 6.684 (p<.01) and 9.231 (p<.01), respectively. Chi-square analysis further highlighted significant differences in the manifestation of sleep paralysis, with vestibular-motor experiences being notably higher among the psychotic group.
Conclusion: The study confirms the higher prevalence of vestibular-motor experiences of sleep paralysis among clinical populations, particularly those with psychotic disorders, compared to non-clinical populations. Intruder and incubus experiences were commonly reported across all groups, indicating a widespread presence of these phenomena regardless of psychiatric diagnosis.
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References
Han KS, Kim L, Shim I. Stress and sleep disorder. Exp Neurobiol. 2012;21(4):141–50.
American Psychiatric Association. Diagnostic and statistical manual of mental disorders. [place unknown]: American Psychiatric Publishing; 2022.
Carskadon M, Dement W. Normal human sleep: An overview. In: Kryger MH, Roth T, Dement WC, editors. Principles and Practice of Sleep Medicine. 4th ed. Philadelphia: Elsevier Saunders; 2005. p. 13–23.
Fakoya AJ, Olunu E, Kimo R, Onigbinde E, Akpanobong M-A, Enang I, et al. Sleep paralysis, a medical condition with a diverse cultural interpretation. Int J Appl Basic Med Res. 2018;8(3):137.
Sharpless B, McCarthy K, Chambless D, Milrod B, Khalsa S, Barber J. Isolated sleep paralysis and fearful isolated sleep paralysis in outpatients with panic attacks. J Clin Psychol. 2010;66(12):1292-1306.
Hinton DE, Pich V, Chhean D, Pollack M. The ghost pushes you down: Sleep paralysis-type panic attacks in a Khmer refugee population. Transcult Psychiatry. 2005;42(2):46–77.
De Jong JT. Cultural variation in the clinical presentation of sleep paralysis. Transcult Psychiatry. 2005;42(1):78–92.
Cheyne J, Rueffer S, Newby-Clark I. Hypnagogic and Hypnopompic Hallucinations during Sleep Paralysis: Neurological and Cultural Construction of the Night-Mare. Conscious Cogn. 1999;8(3):319-337.
Cheyne J. Sleep paralysis episode frequency and number, types, and structure of associated hallucinations. J Sleep Res. 2005;14(3):319-324.
Cheyne J, Pennycook G. Sleep Paralysis Postepisode Distress. Clin Psychol Sci. 2013;1(2):135-148.
Raosoft Inc. Sample size calculator. [Internet]. 2004 [cited year month day]. Available from: http://www.raosoft.com/samplesize.html
Cheyne JA. Situational factors affecting sleep paralysis and associated hallucinations: position and timing effects. J Sleep Res. 2002;11(2):169-177.
Schnurr PP, Spiro III A, Vielhauer MJ, Findler MN, Hamblen JL. J Clin Geropsychology. 2002;8(3):175–87.
Park JH, Yang CK. Sleep paralysis in schizophrenia and mood disorder. Sleep Med Psychophysiol. 2002;9(2):115.
Sharpless B, Barber J. Lifetime prevalence rates of sleep paralysis: A systematic review. Sleep Med Rev. 2011;15(5):311-315.
Cheyne JA. Situational factors affecting sleep paralysis and associated hallucinations: position and timing effects. J Sleep Res. 2002;11(2):169-177.
Abrams M, Mulligan A, Carleton R, Asmundson G. Prevalence and correlates of sleep paralysis in adults reporting childhood sexual abuse. J Anxiety Disord. 2008;22(8):1535-1541.
Simard V, Nielsen T. Sleep paralysis-associated sensed presence as a possible manifestation of social anxiety. Dreaming. 2005;15(4):245-260.
Molendijk ML, Bouachmir O, Montagne H, Bouwman L, Blom JD. The incubus phenomenon: Prevalence, frequency and risk factors in psychiatric inpatients and university undergraduates. Front Psychiatry. 2022 Nov 14;13:1040769.
Denis D, French C, Gregory A. A systematic review of variables associated with sleep paralysis. Sleep Med Rev. 2018;38:141-157.
Cheyne JA, Girard TA. Paranoid delusions and threatening hallucinations: A prospective study of sleep paralysis experiences. Conscious Cogn. 2007;16(4):959–974.