Differential diagnosis of hypersomnias

Imran Ahmed, Shelby Harris, Michael Thorpy

Research output: Contribution to journalReview articlepeer-review

1 Scopus citations


The term hypersomnia is used to identify disorders that are associated with excessive sleepiness, such as idiopathic hypersomnia or narcolepsy. Sleepiness is considered excessive when there is an increased amount of sleep or an increased drive toward sleep during the wake period, making a person unable to sustain wakefulness or alertness. Patients who have excessive sleepiness tend to have involuntary sleep episodes during activities. The hypersomnias either shorten or fragment the major sleep period or are a manifestation of central nervous system dysfunction. This article discusses disorders, including the hypersomnias, that should be considered when evaluating individuals with excessive sleepiness.

Original languageEnglish (US)
Pages (from-to)191-204
Number of pages14
JournalSleep Medicine Clinics
Issue number2
StatePublished - Jun 2012


  • Behaviorally induced insufficient sleep syndrome
  • Hypersomnia
  • Idiopathic hypersomnia
  • Kleine-Levin syndrome
  • Menstrual-related hypersomnia
  • Narcolepsy
  • Recurrent hypersomnia

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Clinical Psychology
  • Clinical Neurology
  • Psychiatry and Mental health


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