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

Hi! My name is Freudly, i am an AI therapist, I will give you an interpretation of the test after you complete it.

08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

12,658 views

1,608 completions

1,206 likes

Verified by Daniel Hall

Psychologist with 25 years of experience

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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

Scale Results
— Explained Clearly

Your scores across each test scale are translated into plain, usable insights. You won’t just get numbers — you’ll learn how your results impact your daily life, emotional state, and overall well-being.

AI-Powered
Interpretation

You’ll receive a structured, clinically-grounded explanation. Our AI analyzes patterns and relationships between scales to provide a coherent interpretation, without exaggerated language.

Statistical
Comparison

See how your results compare to others. Anonymized platform data is used to create a percentile scale, which identifies whether your results are typical.

Practical
Recommendations

You’ll receive clear, actionable guidance tailored to your profile. These easy-to-implement suggestions focus on coping, self-regulation, and realistic next steps.

AI-Powered
Insights

Get insights on behavioral and thought patterns you might not notice on your own. By uncovering subtle connections between your responses, you’ll better understand what may be driving your current results.

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an AI Therapist

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

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Used in 52+ countries

Benchmarking

See How You Compare

Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.

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 on the scale so you can see how you compare.

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CLEAR ANSWERS TO COMMON QUESTIONS

Frequently Asked Questions

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 - Symptoms and Signs

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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