What tool is used to assess insomnia severity?

The Insomnia Severity Index (ISI) is specifically designed to assess the severity of insomnia and its impact on daily functioning. The ISI consists of a series of questions that evaluate the nature, severity, and impact of insomnia symptoms over the past two weeks. It is a validated tool widely used in clinical practice and research to screen for insomnia and monitor treatment effectiveness.

Other tools mentioned may relate to sleep quality or habits, but they do not focus explicitly on insomnia severity. For example, while the Sleep Quality Index assesses overall sleep quality, it does not provide a detailed measure of insomnia's severity or its functional impact. Similarly, the Sleep Habit Questionnaire is more focused on the patterns and behaviors surrounding sleep rather than evaluating the severity of insomnia. Lastly, the Berkeley Sleep Scale is intended to assess various aspects of sleep but is not specifically tailored to measure insomnia severity like the ISI is. Thus, the ISI is the most appropriate and effective instrument for this purpose.