Which tool is commonly used to evaluate subjective sleep quality and disturbances over the past month?

The Pittsburgh Sleep Quality Index (PSQI) is widely recognized as a comprehensive tool designed to evaluate sleep quality and disturbances over the past month. It comprises a self-reported questionnaire that assesses various dimensions of sleep, including sleep duration, sleep disturbances, and overall sleep quality. The PSQI takes into account multiple factors affecting sleep, such as the time it takes to fall asleep, the frequency of waking up during the night, and how restorative the sleep feels upon waking.

In contrast, the Epworth Sleepiness Scale primarily measures daytime sleepiness rather than subjective sleep quality. The Beck Depression Inventory assesses the severity of depression symptoms but does not focus specifically on sleep quality. The Insomnia Severity Index, while related to sleep disturbances, is more narrowly focused on the severity of insomnia symptoms rather than providing a broad assessment of overall sleep quality.

Thus, the PSQI is the most appropriate choice for evaluating subjective sleep quality over the given time frame.