Background: Sleep plays a vital role in our overall health and well-being. However, many individuals suffer from sleep disorders or face challenges with the quality and duration of their sleep. This ...

Detailed information on Pew Research Center international survey meethodology, such as mode of interview, sampling design, margin of error, and design effect, for each country we survey, organized by ...

Historically, public opinion surveys have relied on the ability to adjust their datasets using a core set of demographics – sex, age, race and ethnicity, educational attainment, and geographic region ...