Description: The Insomnia Severity Index (ISI) is a 7-item screening tool that asks respondents to rate the nature and symptoms of their sleep problems.
Adult self-report ages: 18+ years
Scoring: Higher score indicates more severe insomnia symptoms.
Each item is rated 0 to 4.
Score ranges:
0-7: no clinically significant insomnia
8-14: subthreshold insomnia
15-21: clinical insomnia (moderate severity)
22-28: clinical insomnia (severe)
Click below to view the Insomnia Severity Index (ISI).
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