Prevalence
Isolated sleep paralysis is commonly seen in patients that have been diagnosed with narcolepsy. Approximately 30-50% of people that have been diagnosed with narcolepsy have experienced sleep paralysis as an auxiliary symptom. The prevalence of sleep paralysis in the general population is approximately 6.2%. A majority of the individuals that have experienced sleep paralysis have sporadic episodes that occur once a month to once a year. Only 3% of individuals experiencing sleep paralysis that is not associated with a neuromuscular disorder have nightly episodes, as mentioned earlier, these individuals are diagnosed as having RISP. Sleep paralysis is just as common for males as it is for females, however, different age groups have been found to be more susceptible to developing isolated sleep paralysis. Approximately 36% of the general population that experiences isolated sleep paralysis is likely to develop it between 25 and 44 years of age.
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