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Psychiatry Clin Neurosci. 2009 Aug;63(4):546-9. doi: 10.1111/j.1440-1819.2009.01984.x. Epub 2009 May 22.

Sleep paralysis in adolescents: the 'a dead body climbed on top of me' phenomenon in Mexico.

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1
Clinical Services, National Institute of Psychiatry Ramón de la Fuente Muñiz, México DF, México. jimalex@imp.edu.mx

Abstract

AIMS:

The aim of the present study was to evaluate the prevalence and characteristics of sleep paralysis in adolescents using a folk expression.

METHODS:

Three hundred and twenty-two adolescents (mean age, 15.9 +/- 0.88 years; 66.8% female) from three high schools in Mexico City completed both a self-reported questionnaire, including a colloquial definition of sleep paralysis and the Epworth Sleepiness Scale.

RESULTS:

A high proportion of the adolescents (92.5%) had heard about the 'a dead body climbed on top of me' expression and 27.6% of them had experienced the phenomenon. Sleep paralysis was present in 25.5% while the prevalence rate for hypnagogic/hypnopompic hallucinations was 22%; 61% had experienced >or=2 episodes in their lifetime. The mean age of onset was 12.5 +/- 3 years. Sleepiness scores for the subjects who had experienced at least one event were not significantly different from subjects who had not experienced any. In 72% of cases, the episodes were composed of both sleep paralysis and hallucinations while 20.2% consisted of only sleep paralysis and 7.8% of only hallucinations. The number and characteristics of events were not significantly different between adolescents with only one episode and those with two or more episodes.

CONCLUSIONS:

The characteristics of the 'a dead body climbed on top of me' phenomenon suggest that is identical to sleep paralysis and a frequent experience among Mexican adolescents. During adolescence, sleep paralysis seems to be a recurrent phenomenon frequently accompanied by hallucinatory experiences.

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