« Back to Glossary Index

A double-blind trial or study is one in which neither the people who are doing the experiment nor the people who are the subjects of the experiment know which of the groups being studied is receiving the substance under investigation (active group) or is receiving the placebo (control group).

Get SomnusNooze, our e-newsletter

Sign up to receive HF updates, news from the world of sleep research, first-person stories, and more.

You will receive and email from (please check your junk/spam folder if needed) to confirm your subscription to our newsletter through MailChimp. You are not subscribed until you confirm. Thank you for your interest in Hypersomnia Foundation!