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Purpose and methods This study aimed to validate the single-item sleep duration question used in the National Health And Nutritional Survey (NHANES), “How much sleep do you usually get at night on weekdays or workdays (hours)?”, against a wrist-worn accelerometer (ActiGraph GT3X +) in waves 2011–2012 and 2013–2014 among an adult population aged 20 or above ( n  = 8,438, mean age 49.7, 48% male). Results The accelerometer-measured and self-reported sleep duration were 6.01 (SD 1.48) and 6.88 (SD 1.40) h/day, respectively, representing a 0.87 h/day of over-reporting (SD 1.90,  p  &lt; 0.001). Such an over-reporting was observed in all subgroups, where the over-reporting ranged from 0.72 (those aged 41–50) to 1.13 h/day (those aged 71 or above). The correlation between accelerometer-measured and self-reported sleep duration was low ( ρ  = 0.14,  p  &lt; 0.001). Conclusions The associations between sleep duration and other health outcomes identified using NHANES data should be further tested using more accurate and valid measures of sleep duration.

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