Sleeptly

Insomnia screener

Insomnia Severity Index (ISI)

A 7-item self-rating instrument widely used in sleep research and clinical practice. It is a screener, not a diagnosis — but the score points to where on the severity continuum your sleep complaint sits and what the next step usually is.

7 questions. Takes about 90 seconds. Rate each item over the last 2 weeks.

  1. Over the last 2 weeks, how severe was your difficulty falling asleep?

  2. Over the last 2 weeks, how severe was your difficulty staying asleep?

  3. Over the last 2 weeks, how severe was the problem of waking too early?

  4. How satisfied or dissatisfied are you with your current sleep pattern?

  5. How noticeable to others is your sleep problem in terms of impairing the quality of your life?

  6. How worried or distressed are you about your current sleep problem?

  7. How much does your sleep problem interfere with daily functioning (work, mood, concentration, energy)?

About the ISI

The ISI was developed by Bastien, Vallières, and Morin (2001) and is one of the most validated self-report measures for insomnia. It is sensitive to treatment change and is used as a primary outcome measure in CBT-I trials. Cut-offs used here follow the original validation paper: 0–7 (none), 8–14 (subthreshold), 15–21 (moderate clinical), 22–28 (severe clinical).

Sources: Bastien et al., Sleep Med 2001 (PubMed)· Morin et al., Sleep 2011 (validation)

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