to improve your sleep:
Poll Methodology and Definitions
The National Sleep Foundation began surveying American sleep health and behaviors in 1991. The 2010 Sleep in America annual poll was conducted for the National Sleep Foundation by WB&A Market Research, using a random sample of 1,007 adults between the ages of 25-60 and identifying themselves as White, Black/African-American, Asian or Hispanic. This poll has adopted the group definition used by the Centers for Disease Control and Prevention (CDC), the U.S. Census Bureau, and related public health groups; while NSF also acknowledges that this is an imperfect description of race and ethnic groups. No effort was made to verify the accuracy of the respondent's self-identification. Individuals from other ethnic groups were excluded from participating. The Sleep in America Poll Task Force did consider economic factors in analyzing the data. The margin of error is 3.1 percentage points at the 95% confidence level.
2010 Sleep in America Poll Task Force
Sonia Ancoli-Israel, Ph.D. (Chair)
Professor of Psychiatry
Director, Gillin Sleep and Chronomedicine Research Center
Department of Psychiatry
University of California, San Diego
Daniel P. Chapman, Ph.D.