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Abstract Introduction Although quality sleep is crucial for good health, well-being, and cognitive function, racial and ethnic minority populations are at an increased risk of having shorter sleep duration and poorer sleep quality in comparison to other groups. This study, which is nationally representative, intends to show differences in population-level sleep time. Population-level differences in timing have significant public health ramifications because of the important contribution that circadian rhythms play to health. Methods Data were obtained from adults who participated in the National Health And Nutrition Examination Survey (NHANES), overseen by the CDC, for the 2017-2018 and 2019-2020 (March, pre-pandemic) waves. These data were combined and weighted using NHANES sample weights. Habitual sleep timing was assessed as self-reported typical bedtime and wake time, which was converted to minutes from midnight. Race/ethnicity was self-reported as non-Hispanic White, Black/African-American, Mexican-American, Other Latinx, Asian, or Multiracial/Other. Covariates included demographics (age, sex), socioeconomics (education, income-poverty ratio), health (body mass index, overall health rating), mental health (depressed mood), and sleep health (sleep disturbance, daytime tiredness). Results In the fully-adjusted model, compared to non-Hispanic Whites, Blacks/African-Americans went to bed 17.8 minutes later (95%CI [6.011, 29.497], P=0.003) but did not differ regarding wake time. Asians went to bed 17.8 minutes later (95%CI [6.255, 29.365], p=0.003) and woke up 18.9 minutes later (95%CI [5.222, 32.626], p=0.007). Mexican-Americans went to bed 18.0 minutes earlier (95%CI [-30.722, -5.233], p=0.006) and woke up 33.9 minutes earlier (95%CI [-47.737, -20.112], p< 0.0005). The other groups did not significantly differ from non-Hispanic Whites. As a post-hoc analysis, habitual sleep duration was entered as an additional covariate, and bedtime differences between non-Hispanic Whites and Blacks/African-Americans were no longer significant. Conclusion Even after accounting for other elements of sleep, Blacks/African-Americans, and Asians still exhibit delayed sleep. This timing difference may reflect underlying circadian factors, or social ones that may influence timing of sleep. Future work should explore the possibility that circadian disparities exist as well, and may be related to health disparities since circadian rhythms play so many roles in health. Support (if any)