The Insomnia Severity Index (ISI) is a brief self-report instrument measuring the patient’s perception of both nocturnal and diurnal symptoms of insomnia.
The ISI comprises seven items assessing the perceived severity of difficulties initiating sleep, staying asleep, and early morning awakenings, satisfaction with current sleep pattern, interference with daily functioning, noticeability of impairment attributed to the sleep problem, and degree of distress or concern caused by the sleep problem.
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Prof Charles M. Morin, PhD
The ISI was developed as a patient reported outcome measure intended both for screening purpose and for assessing the efficacy of treatment. The original items were generated based on concerns and issues of clinical relevance to patients seeking treatment for insomnia in a sleep disorders clinic. Although it is not intended to be a diagnostic tool, it is widely used to identify potential cases of insomnia and assess the perceived severity of insomnia.
The standard mode of administration is paper-and-pencil self-administration, i.e., completed by the patient. However, alternate forms are also available for administration by a clinician, based on information obtained during a clinical interview, or by a significant other (e.g. spouses), based on knowledge of the patient. These three methods of administration provide complementary, yet semi-independent information. The ISI instructions are slightly altered for the clinician and significant others’ versions.
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The Insomnia Severity Index (ISI) is distributed by Mapi Research Trust on behalf of its copyright holder, Prof Charles Morin.
Mapi Research Trust is a non-profit organization dedicated to improving patients’ quality of life by facilitating access to Clinical Outcomes Assessments (COAs) information by centralizing information. Visit Mapi Research Trust’s website for more information!
Any questions on the ISI, on its conditions of use, its available translations shall be directed to Mapi Research Trust.
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The list of existing and available translations of the ISI is available on ePROVIDE™
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Sleep Review, May 2016
Charles Morin’s books:
Charles M. Morin, PhD, is a professor of psychology and Director of the Sleep Research Center at Laval University in Quebec City. He holds a Canada Research Chair in Behavioral Sleep Medicine.
Professor Morin is considered one of the world leader in the field of behavioral sleep medicine and insomnia. He has published 7 books and more than 250 scientific papers on the topic of insomnia, sleep, and treatment of sleep problems. He has held several leadership positions in the field of sleep medicine, including as former President of the Canadian Sleep Society and current President-Elect of the World Sleep Society.
View Professor Morin’s CV here!