0370 Objective Differences in Sleep Timing Between African Americans and Non-Hispanic Whites. (27th May 2020)

• Record Type: Journal Article
• Authors: Combs, D; Patel, S; Mashaqi, S; Estep, L; Provencio-Dean, N; Lopez, S; Parthasarathy, S
• Is Part Of: Sleep. Volume 43(2020)Supplement 1
• Page Start: A141
• Page End: A142
• Publication Date: 2020-05-27
• Subjects: Sleep -- Physiological aspects -- Periodicals; Sleep disorders -- Periodicals; Sommeil -- Aspect physiologique -- Périodiques; Sommeil, Troubles du -- Périodiques; Sleep disorders; Sleep -- Physiological aspects; Sleep -- physiological aspects; Sleep Wake Disorders; Psychophysiology; Electronic journals; Periodicals; 616.8498
• DOI: 10.1093/sleep/zsaa056.367
• Languages: English
• ISSNs: 0161-8105

Abstract

Abstract: Introduction: Prior studies have shown a morning circadian preference for African Americans compared to Non-Hispanic whites, but prior research has shown that self-reported sleep timing is delayed in African Americans compared to whites. No prior studies have evaluated this difference in sleep timing using objective measures of habitual sleep such as actigraphy. Methods: We analyzed the sleep data from the Multi-Ethnicity Study of Atherosclerosis (MESA), a multi-site community-based cohort with both self-reported and actigraphic measures of habitual sleep variables. Self-reported sleep timing, chronotype as measured by the modified Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ) and actigraphic sleep timing were examined using logistic regression and independent t-tests. Results: 1, 430 participants had self-reported sleep data, and 1, 405 participants had complete actigraphy data as well. There was no self-reported difference in circadian preference between African Americans and whites (mean MEQ score 17.1 ± 3.6 vs. 17.0 ± 4.0). African Americans were 76% more likely to report a bedtime after midnight on weekdays (odds ratio [OR] 1.8, 95% confidence interval [CI] 1.4, 2.3, p<0.001), and 50% more likely on weekends (OR 1.5, 95% CI 1.2, 1.9, p=0.001) as compared to whites. Actigraphic data showed similar results. African Americans were 80% more likely to have actigraphic sleep onset after midnight on weekdays (OR 1.8, 95% CI 1.4, 2.2) and 137% more likely (OR 2.4, 95% CI 1.9, 3.0, p<0.001) on weekends as compared to whites. Actigraphic mid-sleep time was delayed 42 (95% CI 20, 64, p<0.001) minutes on weekdays and 24 (95% CI 6, 42, p=0.01) minutes on weekends in African Americans compared to whites. Conclusion: African Americans had delayed sleep timing compared to whites even though no significant racial differences in chronotype were present. Delayed sleep timing in African Americans may be related to factors other than self-reported circadian preference. Support: Funding to DC from the American Heart Association, University of Arizona Health Sciences Center and NIH-NHLBI. MESA data obtained from NIH-NHLBI BioLINCC and the National Sleep Research Resource.