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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
The Insomnia Severity Index (ISI) is a seven-item self-report tool used to quantify insomnia symptom burden, sleep-related distress, and daytime impact over recent weeks.
Formula: ISI total = sum of 7 item scores (each 0-4), total range 0-28.
Higher ISI totals indicate greater insomnia symptom burden and daytime impact, supporting escalation of targeted sleep-focused care.
Use in outpatient and behavioral-health workflows to baseline insomnia severity and monitor change over time.
The ISI is self-reported and does not directly measure sleep architecture, breathing disorders, circadian disorders, or medication effects without additional assessment.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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