0372 Disparities in Sleep Timing in the US: Data From the National Health and Nutrition Examination Survey 2015-2016

Abstract Introduction Several studies have demonstrated population-level disparities in sleep duration and sleep quality. Population-level estimates of bedtime and waketime have been unavailable. Considering the important role of circadian rhythms in health, population-level disparities in timing have important public health implications. Methods Data from the 2015-2016 National Health and Nutrition Examination Survey (NHANES) from the CDC were used (N=4,491). Typical time in and out of bed were assessed and were converted to minutes. Race/ethnicity was self-reported and coded as non-Hispanic White, Black/African-American, Mexican-American, Other Hispanic/Latino, Asian, and Multiracial/Other. Covariates included age, sex, education level, income/poverty ratio, body mass index, and overall health. Additional models controlled for habitual sleep duration, frequency of sleep disturbance, depressed mood, and daytime tiredness/fatigue. Multiple linear regression analyses with time as an outcome were weighted using CDC-provided NHANES sample weights. Results In adjusted analyses, compared to non-Hispanic Whites, Blacks/African-Americans went to bed 29.4 mins later (p