Abstract: |
Sleep paralysis (SP) is a mixed state of consciousness and sleep, combining features of rapid eye movement
(REM) sleep with those of wakefulness. The exact cause of SP is unknown, and its prevalence varies among
the studies. We aim to identify SP's global prevalence, the affected population's characteristics, and the SP's
clinical picture. We searched three databases (PubMed, Scopus, and Web of Science (WoS)) using a unique
search strategy to identify eligible studies. All observational studies identifying the prevalence or frequency
of sleeping paralysis were included. No exclusions are made based on country, race, or questionnaire. The
analysis was performed using the latest version of R software (R Core Team, Vienna, Austria). The analysis
included 76 studies from 25 countries with 167,133 participants. The global prevalence of SP was 30% (95%
CI (22%, 39%)). There were similar frequencies of isolated SP and SP (33%, 95% CI (26%, 42%), I2 = 97%, P
<0.01; 31%, 95% CI (21%, 43%), I2 = 100%, P = 0, respectively). A subgroup analysis showed that the majority
of those who experienced SP were psychiatric patients (35%, 95% CI (20%, 55%), I2 = 96%, P <0.01). The
prevalence among non-psychiatric patients was among students (34%, 95% CI (23%, 47%), I2 = 100%, P = 0).
Auditory and visual hallucinations were reported in 24.25% of patients. Around 4% had only visual
hallucinations. Meta-regression showed no association between the frequency of SP and sex. Publication
bias was detected among the included studies through visual inspection of funnel plot asymmetry. Our
findings revealed that 30% of the population suffered from SP, especially psychiatric patients and
students. The majority of SP cases lacked associated hallucinations, while a noteworthy proportion
experienced combined visual and auditory hallucinations.
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