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Sleep Details sleep tracking app for Apple Watch
Learn about your sleep habits with Sleep Details 

Sleep Details tracks your sleep related data and shows you daily sleep score based on data collected by your Apple Watch. Sleep Details tracks following sleep related data: Sleep time, Activity while sleeping, Heart rate, Heart rate variability (HRV), Respiratory rate (available for users running watchOS 8 or later), Blood oxygen levels (SpO2 available only on Apple Watch series 6 and later devices).