Insomnia Severity

Also known as: ISI · Insomnia index

Subjective perception of insomnia severity across three nighttime symptoms (difficulty initiating, maintaining, and early awakening) plus daytime interference, satisfaction with sleep, noticeability, and distress. Yields a single severity index with published clinical cutoffs.

Source:

Bastien, C. H., Vallieres, A., & Morin, C. M. (2001). Validation of the Insomnia Severity Index as an outcome measure for insomnia research. Sleep Medicine, 2(4), 297-307.

DOI:

10.1093/sleep/24.5.591