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Genetic and Rare Diseases Information Center (GARD)

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Idiopathic hypersomnolence


Other Names for this Disease

  • Idiopathic hypersomnia
  • Idiopathic hypersomnolence
  • Primary hypersomnia
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Overview

Idiopathic hypersomnolence is excessive sleeping (hypersomnia) without an obvious cause. It is different from narcolepsy in that idiopathic hypersomnia does not involve suddenly falling asleep or losing muscle control associated with strong emotions (cataplexy). Symptoms often develop slowly during adolescence or young adulthood and may include daytime naps that do not relieve drowsiness, difficulty waking from a long sleep, increased need for sleep during the day, and increased sleep time (up to 14 - 18 hours per day). Other symptoms may include anxiety, feeling irritated, low energy, restlessness, slow thinking or speech, loss of appetite, and memory difficulty.[1]

Last updated: 8/4/2010

References

  1. Schriber A. Idiopathic hypersomnia. MedlinePlus. 2009; http://www.nlm.nih.gov/medlineplus/ency/article/. Accessed 8/4/2010.
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Basic Information

  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The Merck Manuals Online Medical Library provides information on this condition for patients and caregivers. 

In Depth Information

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  • MeSH® (Medical Subject Headings) is a terminology tool used by the National Library of Medicine. Click on the link to view information on this topic.
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Idiopathic hypersomnolence. Click on the link to view a sample search on this topic.
Other Names for this Disease
  • Idiopathic hypersomnia
  • Idiopathic hypersomnolence
  • Primary hypersomnia
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.