The National Sleep Foundation commissioned WB&A Market Research to conduct this public opinion poll exploring characteristics of American bedrooms and the perceived effect of the bedroom environment on sleep. A total of 1,500 telephone interviews were conducted. In order to qualify for this study, respondents had to be between the ages of 25-55. The survey averaged 13.1 minutes in length.
Within the listed sample, the following four ethnic groups were targeted to provide equal representation across each: White, Black, Asian, and Hispanic. Specifically, the Black population was targeted by the African-American Census Tract, the Asian population was targeted by Asian surnames, and the Hispanic population was targeted by Hispanic surnames.
In survey research, the entire population is typically not interviewed, but rather a sample of that population is polled. Therefore, the data are subject to sampling error. The maximum sampling error of the data for the total sample of 1,500 interviews is ±2.5 percentage points at the 95% confidence level. The sampling error will vary depending on the sample size and the percentages being examined in the sample.