Adherence
A heuristic algorithm (HDCZA) applied to raw wrist-worn accelerometer data can accurately estimate the Sleep Period Time window (SPT-window) without requiring a sleep diary.
To track your sleep without keeping a diary, use a wrist-worn fitness tracker that records raw acceleration data. Ensure it is worn on your non-dominant wrist continuously. The device's software (using algorithms like HDCZA) will automatically determine your sleep window based on movement and body angle, providing a reliable estimate of your sleep duration and timing without you needing to manually log your bedtime or wake time.
We demonstrated the accuracy of our algorithm to detect the SPT-window. The value of this algorithm lies in studies such as UK Biobank where a sleep diary was not used.
Why this rating
Validated against Polysomnography (gold standard) in clinical and healthy cohorts, and against sleep diaries in a large cohort (N=3752), showing high concordance statistics (C-statistic ~0.86).
Source
Estimating sleep parameters using an accelerometer without sleep diary
Vincent T. van Hees et al. · Scientific Reports · 2018
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