Which description fits the Pittsburgh Sleep Quality Index?

The Pittsburgh Sleep Quality Index (PSQI) is indeed best described as a complex questionnaire. It is designed to evaluate sleep quality and disturbances over a one-month period, and it encompasses multiple components that capture various aspects of sleep, including sleep duration, sleep disturbances, timing of sleep, and daytime functioning.

This complexity allows the PSQI to provide a comprehensive overview of an individual's sleep patterns and issues, making it a valuable tool in both clinical and research settings for assessing sleep quality. The PSQI evaluates several domains and yields a score that reflects overall sleep quality, which cannot be adequately captured by a simple assessment or brief questionnaire.

Other assessments aimed at sleep issues may be simpler or more focused, but the PSQI's multifaceted approach sets it apart as a more intricate tool for understanding sleep health holistically.