In this lesson, students learn about sleep, sleep cycles and the purpose of sleep through a collaborative inquiry and the production of a Public Service Announcement (PSA) or poster. Students collect class data through sleep diaries and sleepiness scales over 11 days, and they collect class survey data on attitudes and myths about sleep. The compiled results from these studies are available to all students through Google Docs. Students use resources to answer additional questions about sleep, then design PSAs or posters to promote healthy sleep habits for their peers. This lesson is appropriate for a 9-12 Psychology, Physiology or Health class.