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Insomnia is characterised by persistent difficulty initiating or maintaining sleep despite adequate opportunity, leading to day-time impairment in concentration, mood, or performance. Clinicians quantify its severity to guide treatment and monitor progress. The Insomnia Severity Index distils subjective sleep complaints into a concise numerical score reflecting frequency, intensity, and functional impact.
This interactive assessment adapts the Insomnia Severity Index into a seven-item digital form. Each item is rated from none to very severe, yielding a total score between zero and twenty-eight. A colour-coded gauge and plain-language feedback place your result within established clinical bands, making it easier to understand what the number means for your sleep health.
Complete the questionnaire in under two minutes, review your personalised result, and optionally download or discuss it with a professional. Always answer based on the last two weeks and typical sleep opportunities. This screen does not diagnose or treat medical conditions; consult a qualified clinician if sleep difficulties persist or worsen.
The Insomnia Severity Index (ISI) is a psychometric instrument validated across diverse populations for screening and outcome tracking. Each of the seven items aligns with the diagnostic criteria for insomnia—sleep initiation, maintenance, early awakening, satisfaction, functional impact, external noticeability, and distress. Summative scoring transforms ordinal responses into an interval-level measure that correlates strongly with clinical interviews and polysomnographic indices, enabling rapid triage and progress monitoring.
A lightweight reactive engine updates scores in real time as answers change. A charting layer renders a semicircular gauge whose coloured segments mirror published severity bands, reinforcing comprehension through dual coding. All computation executes client-side, preserving privacy and eliminating network latency.
| Symbol | Meaning | Unit | Typical Range | Sensitivity |
|---|---|---|---|---|
| ri | Response to item i | score | 0 – 4 | linear |
| S | Total ISI score | score | 0 – 28 | high |
The summed score of 11 places the respondent within the subthreshold band, suggesting mild concern and benefit from behavioural adjustments.
The algorithm runs in O(7) time with negligible memory overhead, ensuring instant feedback even on low-power devices. All operations occur in JavaScript’s double-precision context, yielding millisecond-level execution. The charting layer reflows responsively on resize events, and throttled observers prevent unnecessary redraws.
Follow these steps to obtain and interpret your score.
All answers remain in your browser’s memory and vanish when you close the tab; nothing is transmitted or saved remotely.
Ranges map total points to clinical severity levels, guiding whether simple habit changes or professional help are advisable.
Yes. Click any question in the sidebar to revise your choice; results update automatically.
No. It offers educational insight only; persistent sleep problems warrant evaluation by a qualified clinician.
Short recall periods improve accuracy and align with research protocols that validate the index.