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Updated: Aug 15, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
Conditions of primary excessive daytime sleepiness
Jed E Black1, Stephen N Brooks, Seiji Nishino
1Stanford Sleep Disorders Center, Sleep Medicine Division, Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, USA. MajorSleep@yahoo.com
Abstract:
Excessive daytime somnolence is a prevalent problem in medical practice and in society. It exacts a great toll in quality of life, personal and public safety, and productivity. The causes of EDS are myriad, and careful evaluation is needed to determine the cause in each case. Although much progress has been made in discovering the pathophysiology of narcolepsy, much more remains to be understood, and far less is known about other primary conditions of EDS. Several methods have been developed to assess EDS, although each of them has limitations. Treatment is available for the great majority of cases.
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