An Indian origin researcher led a study that has found Indians sleep less when compared to white, American-born adults.
Two studies have reported sleep disparities among Americans based on racial and ethnic background.
The first study, out of the State University of New York (SUNY), looked at 400,000 respondents from the National Health Interview Surveys between 2004 and 2010.
Results show that Americans born in the United States were more likely to report sleeping longer than the recommended seven to nine hours each night.
African-born Americans were more likely to report sleeping six hours or less, and Indian-born Americans reported six to eight hours a night.
"We think social desirability might be playing a role in the self-reported data," Abhishek Pandey, lead author of the study, said.
"We think that insufficient sleep might be more prevalent in the population than the actual self report data, but under- or over-reported to project a better image of one's perceived sleep health," he said.
On a smaller scale, sleep researchers at Northwestern University Feinberg School of Medicine in Chicago analyzed the sleep measurements of 439 randomly selected Chicago men and women, including surveys about sleep quality and daytime sleepiness.
They found that white participants slept significantly longer than the other groups, and blacks reported the worst sleep quality. Asians had the highest reports of daytime sleepiness.
"These racial/ethnic differences in sleep persisted even following statistical adjustment for cardiovascular disease risk factors that we already know to be associated with poor sleep, such as body mass index, high blood pressure and diabetes," Mercedes Carnethon, principal investigator and lead author of the Northwestern study, said.
"And we excluded participants who had evidence of mild to moderate sleep apnea. Consequently, these differences in sleep are not attributable to underlying sleep disorders but represent the sleep experience of a 'healthy' subset of the population," Carnethon said.
Pandey's investigation also indicated that foreign-born Americans were less likely to report short or long sleep than U.S.-born Americans after adjusting for effects of age, sex, education, income, smoking, alcohol use, body mass index (BMI) and emotional distress.
The findings of the study will be presented at SLEEP 2012.