Johns Hopkins Psychiatry Guide

Hypersomnolence Disorder

Akachimere Uzosike, , David Neubauer, M.D.
Hypersomnolence Disorder is a topic covered in the Johns Hopkins Psychiatry Guide.

To view the entire topic, please or purchase a subscription.

Johns Hopkins Guides provide diagnosis, management, and treatment guidance for infectious diseases, diabetes, and psychiatric conditions. Explore these free sample topics:

Johns Hopkins Guides

~~ The first section of this topic is shown below ~~


  • Hypersomnolence disorder is characterized by repeated excessive sleepiness after at least seven hours of a main sleep period.
    • In other words, repeated excessive sleepiness despite getting at least seven hours of sleep.
  • Individuals with hypersomnolence and cataplexy are diagnosed with narcolepsy, as are hypersomnolent patients with specific sleep testing results.
  • Hypersomnolence disorder is classified under the Sleep-Wake Disorders section of the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) [1].
    • The DSM-5 specifies that the excessive sleepiness should occur multiple times per week over a course of months and be accompanied by significant distress or impairment [1].

~~ To view the remaining sections of this topic, please
or purchase a subscription ~~

Last updated: October 17, 2014