Sleep Related Questionnaires

Insomnia Severity Index (ISI)

Name of questionnaire  Insomnia Severity Index (ISI)
Type of questionnaire To detect and quantify the patient's perception of insomnia severity, assess its impact on daytime functioning, and monitor treatment response in adults
Number of items 7 items
Number of domains/categories 5 domains
Name of categories/domains   Severity of insomnia, sleep dissatisfaction, interference with daytime functioning, noticeability of sleep problems to others, degree of worry caused by insomnia
Scaling of items 5 point Likert scale
Scoring available: with permission or free With permission
Scoring test-retest reliability Yes
Scoring internal consistency Yes, Cronbach α = 0.90 and 0.91
Validity Yes, face and content validity; correlated with sleep diaries, polysomnography, and interviews; cutoff score of 10 had a 86.1% sensitivity and 87.7% specificity for detecting insomnia cases in the community sample.
Available forms (short and/or long etc.) Available in three versions: patient, clinician, and significant others (usually a spouse)
Language English
Translations in other languages: Afrikaans, Arabic, Bosnian, Bulgarian, Cantonese, Chinese, Croatian, Czech, Danish, Dutch, Estonian, Finnish,  French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Macedonian, Malay, Mandarin, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Sotho, Spanish, Sweedish,  Tamil, Tswana, Turkish, Ukranian, Urdu, Xhosa, Zulu
Developer name Charles M. Morin, PhD
Developer contact information for permission

Charles Morin
Laval University
School of Psychology
2325 rue des Bibliothèques
Québec (Québec)
G1V 0A6

Availability of questionnaire: Use with permission from developer
Limitations Limited ability to differentiate primary insomnia from insomnia with comorbid psychiatric or other medical disease
Link to the questionnaire (if available) N/A
Patient populations in whose questionnaire has been validated English, Spanish, French, Arabic, Hindi, German, Korean, Chinese, Iranian, Italian
References (including original publication, validity and reliability in different countries/languages, populations and long/short versions)

1. Morin CM, Insomnia, psychological assessment and management. Guilford Press, New York, 1993
2. Bastein CH, et al. Validation of the Insomnia Severity Index as an outcome measure for insomnia research.  Sleep Medicine.  2001; 2 (4): 297 – 307
3. Morin CM, Belleville G, Bélanger L, Ivers H. The Insomnia Severity Index: Psychometric Indicators to Detect Insomnia Cases and Evaluate Treatment Response. Sleep. 2011;34(5):601-608
4. Fernandez-Mendoza,J. et al. The Spanish version of the Insomnia Severity Index: A confirmatory factor analysis. Sleep Medicine. 2011; 13(2):207-210
5. Suleiman K, et al. Translating the Insomnia Severity Index Into Arabic.  J. Nursing Scholarship 2011; 43(1):49-53
6. Lahan V, et al. Translation and Validation of the Insomnia Severity Index in Hindi Language Indian J Psychol Med. 2011, 33(2): 172–176.
7. Yazdi Z, et al. Validity and Reliability of the Iranian Version of the Insomnia Severity Index. The Malaysian Journal of Medical Sciences: MJMS. 2012; 19(4):31-36.
8. S. Badiee Aval Baghyahi et al.  Reliability and validity of the chinese translation of insomnia severity index (C-ISI) in chinese patients with insomnia. European Psychiatry. 2013, 28(1).
9. Gerber M, et al. Validation of the German version of the insomnia severity index in adolescents, young adults and adult workers: results from three cross-sectional studies. BMC Psychiatry. 2016;16: 174
10. Yong Won Cho, et al. Validation of a Korean Version of the Insomnia Severity Index. Journal of Clinical Neurology (Seoul, Korea). 2014;10 (3):210-215.
11.  Castronovo V, et al, Validation study of the Italian version of the Insomnia Severity Index (ISI).  Neurol Sci. 2016; 37(9):1517-24.

Updated by  Mary Anne Tablizo, MD
The last date of update  June 2023