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  1. Jerome Siegel

Published Online: 30 JAN 2010

DOI: 10.1002/9780470479216.corpsy0578

Corsini Encyclopedia of Psychology

Corsini Encyclopedia of Psychology

How to Cite

Siegel, J. 2010. Narcolepsy. Corsini Encyclopedia of Psychology. 1–2.

Author Information

  1. University of California, Los Angeles

Publication History

  1. Published Online: 30 JAN 2010


Narcolepsy is a disorder characterized by persistent daytime sleepiness. Despite this daytime sleepiness, narcoleptics often do not sleep well at night. In addition to sleepiness, narcoleptics have REM (Rapid Eye Movement) sleep shortly after they go to sleep, in contrast to the 1–1.5 hours taken by normal individuals before their first REM sleep period. Thus short sleep latency, indicative of sleepiness, plus REM sleep shortly after sleep onset, can be used to diagnose narcolepsy.


  • narcolepsy;
  • REM sleep;
  • hypocretin;
  • orexin