Insomnia Severity Index (ISI) Test

Understand how much sleep trouble is affecting your life in about 2 minutes. Seven quick items give a clear severity score to support diagnosis and track change over time.

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Questions: 72 minutes

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08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

12587 views

1502 completions

1206 likes

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How the Scales are Structured

example score

25/28

Insomnia Severity Index (ISI)

Measures the severity of self-reported insomnia symptoms and their impact on sleep and daytime functioning.

None to subthreshold

Moderate

Severe

0 – 14: None to subthreshold | 15 – 21: Moderate | 22 – 28: Severe

A score of 25 falls in the Severe range (22–28), indicating very pronounced insomnia symptoms on this scale.

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DATA-BASED USER COHORTS

Who Usually Takes This Test?

Poor sleepers seeking answers

41%OF USERS

People who struggle to fall asleep, stay asleep, or wake unrefreshed use it to understand how severe their sleep problems are.

Clients in therapy

33%OF USERS

People working with a psychologist or psychiatrist take it to track insomnia symptoms over time and see whether treatment is helping.

Patients with health conditions

26%OF USERS

People whose stress, pain, medications, or chronic illnesses affect sleep take it to quantify how much insomnia impacts daily life.

BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.

RESULTS YOU CAN ACTUALLY USE

What You’ll See After You Finish the Test

Scale Results
— Explained Clearly

Your scores across each test scale, translated into plain, usable insights. Not just numbers, but what they actually mean for your daily life, emotional state, and overall well-being.

AI-Powered
Interpretation

A structured, clinically grounded explanation. Our AI analyzes patterns and relationships between scales to provide a coherent interpretation — without alarmist language.

Statistical
Comparison

See how you compare to others. Your scores are placed in a statistical context, showing percentiles and trends based on anonymized platform data to help you understand what`s typical.

Practical
Recommendations

Actionable guidance tailored to your profile. Receive clear, realistic suggestions you can apply immediately — focused on coping, self-regulation, and realistic next steps.

AI-Detected
Insights

Key patterns you might not notice on your own. Surfacing subtle connections in your responses that help you better understand what may be driving your current results.

Discuss with
an AI Psychologist

Clarify, reflect, and explore right away. Talk through your outcomes, ask questions, and explore meanings in a calm, non-diagnostic dialogue environment.

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Used in 52+ countries

Benchmarking

See How You Compare

Once you finish the test, your results will be compared with real-world data from people in your country.
Below is a preview of the benchmarks we use to place your score in context.

Insomnia Severity Index (ISI)

Average

8.2

Normal range

4.4 — 12

min.

max.

majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear here so you can see where you land.

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Trusted by 22k+ Users Worldwide

CLEAR ANSWERS TO COMMON QUESTIONS

Frequently Asked Questions

Any questions left?

What does this questionnaire measure?

It measures the severity of sleep difficulties and related daytime impact. It provides a single score that reflects overall symptom burden.

What time period should be considered when answering?

Use the past two weeks as the reference period. If sleep varied, select the response that best reflects the overall pattern.

How long does it take and how many items are included?

Completion time is about 2 minutes. It includes 7 items.

How should responses be selected?

Choose one option per item that best matches typical sleep experience and distress. Use the full range of options when appropriate.

How are results used?

The total score indicates the level of insomnia severity and supports screening and treatment planning. It can also be repeated to track change over time.

WHAT THE TEST MEASURES

About This Assessment

Insomnia Severity Index (ISI) Test

sleep

When patients report sleep difficulties, a brief standardized measure can help quantify perceived impact and guide next steps. The Insomnia Severity Index (ISI) is a self-report instrument developed by Charles M. Morin to assess perceived insomnia-related symptoms and associated distress.

The measure contains 7 items and typically takes about 2 minutes to complete. Items focus on subjective difficulty with sleep onset and sleep maintenance, satisfaction with sleep, interference with daytime functioning, and concern about current sleep problems, yielding a quantitative estimate of symptom severity.

The Insomnia Severity Index (ISI) can be used in clinical settings to support screening and severity monitoring and in research to track change over time (e.g., pre- to post-intervention) based on patient-reported outcomes.

Author: Charles M. Morin

Literature: Buysse, D. J. Insomnia. JAMA. 2013.; Morin, C. M., & Espie, C. A. The Oxford handbook of sleep and sleep disorders. Oxford University Press. 2012.; Bastien, C. H., Vallières, A., & Morin, C. M. Validation of the insomnia severity index as an outcome measure for insomnia research. Sleep Medicine. 2001.

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