Ethnic
and geographic variation in self-reported sleep duration has
been noted.16,17 A nationwide survey of 32,749 adults aged 18
years or older in the United States showed that compared with
Caucasians, African Americans and other non-Hispanics, including
Asian Americans, were more likely to be short or long
sleepers, and the relative risks ranged from 1.26 to 1.62.16 In
a population-based survey of 3,158 adults, the prevalence of
reduced habitual sleep time was higher in African Americans
than Caucasians (18.7% vs. 7.4%)