Should You Compare Wearable Data Against the PSQI, and How Do You Interpret Discrepancies?

It is one of the most common questions we hear from teams designing real-world wearable sleep studies: you have a device producing nightly estimates of total sleep time, sleep efficiency, and wake after sleep onset, and you have a validated questionnaire like the Pittsburgh Sleep Quality Index (PSQI) sitting in your enrollment battery. The instinct […]