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The objective of this chapter is to describe the current landscape in health disparities science in the United States. After providing a brief overview of health disparities, we summarized the available influential published studies on inadequate sleep duration, poor sleep quality, and a group of commonly reported sleep disorders including insomnia, Obstructive Sleep Apnea, Narcolepsy, Restless Leg Syndrome and Periodic Limb Movement. Overall, despite the heterogeneity in methodology measures and study population, black men and women report the shortest objective sleep duration relative to their white counterparts; while specific Hispanic subgroups may have been particularly at high risk for sleep disordered breathing. Several critical gaps remain with respect to other racial/ethnic groups and sexual minorities. Overall, we underlined the complex relationship between SES measures and perceived sleep …