Pew Research Center is committed to meeting the highest methodological standards — and to exploring the newest frontiers of research. Learn more about the methods the Center uses to conduct objective, ...

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 ...