Lack of Agreement between Polysomnography and Accelerometry Devices for Measuring Sleep Efficiency and Movement in University Students

Validation of the National Health And Nutritional Survey (NHANES) single-item self-reported sleep duration against wrist-worn accelerometer

“…All these methods are validated against the gold standard of sleep measurement in a laboratory condition, polysomnography [4][5][6], although discrepancies have been observed between these sleep measures and polysomnography, and the validity varied among subjects with sleep disorders [7]. Among these three measurements, accelerometry is the only objective measurement, and it has become more popular in sleep research due to its decreasing cost and ability to collect additional data such as physical activity and both electric and outdoor sunlight exposure [8]; therefore, accelerometry is also being regarded as a standard of sleep measurement in a free-living condition [9,10], albeit with an overestimation in sleep duration and underestimation in wake after sleep onset and sleep onset latency [11].…”