National Sleep Foundation

Chapter 4: Primary Hypersomnias


The overall prevalence of narcolepsy in the general population of the United States and Europe is about 0.05 percent.24, 25  The prevalence varies worldwide from less than 0.02 percent of the population in Israel, to about 0.15 percent of the population in Japan.26  In general, narcolepsy affects 1 in 3,000 individuals.27


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  2. Guilleminault C, Yuen KM, Gulevich MG, Karadeniz D, Leger D, Philip D. Hypersomnia after head-neck trauma: a medico-legal dilemma. Neurology. 2000;54:653-659.
  3. Martinez-Rodriguez JE, Lin L, Iranzo A, et al. Decreased hypocretin-1 (Orexin-A) levels in the cerebrospinal fluid of patients with myotonic dystrophy and excessive daytime sleepiness. Sleep. 2003;26:287-290.
  4. Leschziner, G, Narcolepsy: a Clinical Review, Pract Neurol 2014; 0:1–9. doi:10.1136/practneurol-2014-000837.