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WHOOP Sleep Validation | How WHOOP Measures Sleep | WHOOP

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WHOOP Sleep Performance is an easy-to-understand indicator of whether you slept well. This score is calculated based on several factors that provide a comprehensive overview of your nighttime recovery : Your sleep performance is based on all of these factors, providing you with a holistic picture of the quality and quantity of your sleep. The Sleep Planner provides tips for improving your sleep performance that fit your habits, schedule, and goals, so you can develop a suitable sleep routine, go to bed at the optimal time, and wake up refreshed. You can find the Sleep Planner on the app homepage by tapping "Sleep for Tonight." After more than two years of research and validation using polysomnography (PSG) data from Central Queensland University and the University of Arizona, WHOOP has further improved its measurement of the different sleep stages ( light , REM , and deep sleep , as well as waking phases). This allows the sleep data to reflect the body's recovery state even more accura

Topics Article Sleep Sensors Sleep Accuracy: How WHOOP Measures and Scores Sleep By Emily Capodilupo January 23, 2026 When you're making decisions about your training , recovery, and sleep, the quality of your data matters. WHOOP is built on a foundation of precision—collecting heart rate data points every second, 24/7, to deliver insights you can trust. But how accurate is WHOOP, really? In this guide, we'll walk through the technology behind our sensors, the validation studies that confirm our accuracy, and the factors that can influence data quality. You'll see how precise measurement trans

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