![]() So what does the SRI paper Oura likes to quote as proving its accuracy say? Science Behind the Analytics: Detecting Sleep Stages ![]() However, information about sleep stage composition, fundamental in studying sleep and sleep disorders, is not provided." ![]() Most importantly, actigraphy relies on a single sensor, an accelerometer, and thus it provides a measure of motion from which it predicts sleep and wake states. "Compared to PSG, actigraphy has high sensitivity (ability to detect sleep) although specificity (ability to detect wakefulness) is lower ( Marino et al., 2013 Sadeh, 2011), with a wide range of accuracy, depending on the amount of night-time wakefulness ( Paquet, Kawinska, & Carrier, 2007), the algorithms used and the particular population studied ( Van de Water, Holmes, & Hurley, 2011).
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