The Insomnia Severity Index (ISI)

The Insomnia Severity Index (ISI) is a questionnaire used to measure how severe a person’s insomnia is. It asks about difficulties falling asleep, staying asleep, waking up too early, and how insomnia affects daily life. Respondents rate their experiences over the past two weeks, providing insight into sleep problems' intensity and impact. Healthcare providers use ISI scores to assess sleep issues, monitor changes over time, and guide treatment decisions. It’s a useful tool for understanding and managing insomnia effectively.