Fitbit Flex: an unreliable device for longitudinal sleep measures in a non-clinical population
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Clinicians and researchers are increasingly interested in employing tracking devices to measure activity and sleep, both of which are calculated via algorithms that use accelerometer data . While polysomnography (PSG) is viewed as the gold standard for assessing sleep, it is costly, time-intensive, and intrusive. Actigraphy is often preferred in situations for which PSG is not indicated, such as naturalistic conditions or for prolonged observations—days to weeks. However, actigraphs are relatively expensive as well, making them unsuitable to monitor large samples. As such, activity-tracking devices have been proposed as an alternative. Several recent reports, including one by Montgomery-Downs  published in this journal, suggest that consumer-level devices might offer a valid and reliable alternative, as they are easy to use and relatively low in cost [2, 3, 4]. We are writing this letter to report our disappointing experience with Fitbit Flex to measure sleep in a...
KeywordsCollege Student Sleep Mode Sleep Parameter Baseline Data Collection Online Video
Conflict of interest
Drs. Baroni and Bruzzese and Ms. Di Bartolo have no conflicts of interest to declare. Dr. Shatkin receives royalties for publication from W.W. Norton & Company.