Have you ever wondered whether it's worthwhile to pull an all-nighter in hopes of improving your grades on an exam the next day? Have you ever noticed that you snack more when you're having trouble sleeping? And why is it that some individuals seem to have the most energy late at night, while others are most alert early in the morning? This course is designed to orient students to the fascinating world of sleep and psychosocial functioning. We will briefly explore the architecture of sleep and analyze theoretical explanations for the functions of sleep. The bulk of the course will focus on examining predictors and consequences of ("normal") sleep in relation to various aspects of psychosocial functioning, including mental health, interpersonal relationships, technology use, cognitive functioning, and chronotype. We will examine these associations specifically within the context of late childhood, adolescence, and emerging adulthood. As part of this course, you will have the opportunity to track your own sleep via an objective sleep monitor and keep a sleep diary for part of the course.