Insomnia Severity Index
The ISI is a 7-item self-report questionnaire designed to assess the severity of insomnia in adolescents and adults. Developed by Morin and colleagues and validated in 2001, it measures difficulty falling asleep, difficulty staying asleep, early morning awakening, and daytime functional impairment due to sleep problems. The ISI is brief (2–3 minutes), psychometrically sound, and widely adopted in sleep research, primary care, and behavioral sleep medicine clinics for screening, baseline assessment, and treatment monitoring.
Source record
Citations copied verbatim from the method’s source record. No claim-level verification is inferred from them.
- Morin, C. M., Belleville, G., Bélanger, L., & Ivers, H. (2011). The Insomnia Severity Index: Psychometric indicators to detect insomnia cases and evaluate treatment response. Sleep, 34(5), 601–608. · DOI 10.1093/sleep/34.5.601
- Bastien, C. H., Vallières, A., & Morin, C. M. (2001). Validation of the Insomnia Severity Index as an outcome measure for insomnia research. Sleep Medicine Reviews, 5(5), 377–383. · DOI 10.1016/s1389-9457(00)00065-4
- Morin, C. M. (2006). Insomnia: Psychological assessment and management. New York: Guilford Press. · URL
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