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The Official Website of the Epworth Sleepiness Scale

This is a personal website of Dr Murray Johns, dealing only with the Epworth Sleepiness Scale (ESS) which Dr Johns developed in 1990.

Dr Johns was the Founding Director of the Sleep Disorders Unit at Epworth Hospital, Melbourne, Australia. That is where the name of the ESS came from. He developed the ESS initially so he could assess the daytime sleepiness of patients in his own private practice of Sleep Medicine. The ESS was first published in 1991 (Murray W Johns. A new method for measuring daytime sleepiness: the Epworth Sleepiness Scale, Sleep, 1991; 14 (6): 540-545). The questionnaire was subsequently modified slightly in 1997 (see below). It has become the most frequently used method worldwide for assessing a person’s average level of daytime sleepiness in daily life.

Dr Johns owns the copyright to the ESS (Copyright © M.W.Johns 1990-1997).

Dr Johns permits use of the ESS by individual people (including clinicians and researchers) free of charge.

All other users of the ESS, such as Corporations, Governmental Agencies, and funded groups (eg group practices, hospitals, not-for-profit organizations, University institutions) must have a license to use the ESS.

All enquiries about using the ESS, whether free of charge or under license, should be made to MAPI Research Trust, in Lyon, France, the organization that has been contracted to manage use of the ESS worldwide, in English and other languages: www.mapi-trust.org

Dr Johns has another personal website www.mwjohns.com which deals with all other aspects of his research and clinical practice of Sleep Medicine, and other topics on which he has published.