Insomnia Impact Scale

Last updated: June 6, 2019

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The information on this website is not intended to replace a one-on-one relationship with a qualified health care professional and is not intended as medical advice. Read our full medical disclaimer.

Insomnia is a sleep disorder that affects millions of people around the world. Insomnia is a disorder that affects not just an individual person but society as a whole. A person with insomnia is often unable to properly function at work. This is due to excessive daytime sleepiness, a common symptom of insomnia. They also lack focus which can lead to a subpar performance in the workplace. This poor performance can lead to a decline in work output and can also possibly lead to workplace accidents and injuries.

The annual direct personal cost of insomnia is around $14 billion. This is according to a 1999 estimate by Walsh and Engelhardt. This is why it is important to come up with a quantitative definition of insomnia.

What is the Insomnia Impact Scale?

The Insomnia Impact Scale is the most comprehensive index of daytime functioning in insomnia. However, the Insomnia Impact Scale is not as widely used. Other means of measuring sleepiness gets used more often. In fact, less than 10 studies used IIS as a quantitative research aid. That’s less than 10 studies since 1999. One possible reason for this is the lack of published norms from which a researcher can compare the IIS results. This is an important aspect of research. The consistency of the data gathered in the ISS is verifiable by comparing it to another source.

This is a self-test with 40 negative statements. The statements are about the impact of sleep disorders in daytime functions. The questions cover five areas of impairment. There are questions on cognitive, physical, social, occupational and emotional impairment.

How does it work?

The patient needs to rate each of 40 statements. A patient can rate each statement between 1 and 5. The rating indicates how much they agree with the statement.

Sample questions include:

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  • Others can tell by looking at me when I’m not sleeping well.
  • Poor sleep can make me feel depressed.
  • Poor sleep prevents career advancement.

Once the patient answers all of the questions the scores get tabulated. The total score can range from 40 to 200. A high score indicates a sleep disorder. A higher score means insomnia has a more severe effect on the patient’s daytime functions. A score of 125 and above is evidence of a significant disruption in a person’s daytime functioning.

Additional Resources:

The information on this website is not intended to replace a one-on-one relationship with a qualified health care professional and is not intended as medical advice. Read our full medical disclaimer.

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