Activity monitoring devices claiming to measure sleep have increased in popularity within research and consumer settings. However, validation studies on many of these devices are lacking. We examined twenty-nine healthy adults (Mage = 32.4, SDage = 11.6) overnight using three activity monitors (Actiwatch Spectrum Pro standard and sensitive settings, Fitbit One, Jawbone UP2) and polysomnography. We evaluated agreement between each device and polysomnography on total sleep time (TST) and sleep efficiency (SE). Clinically meaningful limits of agreement were set at ±30 minutes for TST and ±5% for SE. Each activity monitor overestimated TST and SE compared to polysomnography, and except for Actiwatch Spectrum Pro in sensitive setting, exceeded clinically meaningful agreement limits. Using Actiwatch Spectrum Pro sensitive as the gold standard, both consumer devices overestimated TST and SE, but their mean errors were generally not clinically meaningful (except Fitbit One’s error for SE). Actiwatch Spectrum Pro in its sensitive setting may be a valid substitute for polysomnography when measuring TST and SE. Choice of consumer device as an actigraphy replacement will depend on context. Jawbone UP2 shows closer agreement with Actiwatch Spectrum Pro, though Fitbit One demonstrates less variation in TST and SE estimations.
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