The purpose of this book is to survey the limited scientific knowledge about how sleep intersects with personality and social behavior. This edited volume establishes a new interdisciplinary field of inquiry about sleep that examines sleep processes in the context of social behavior and social-cognitive processes (e.g., liking, respecting, helping, hurting, achieving), as well as individual differences in personality (i.e., chronic patterns of emotion, thought, and behavior). Contributors identify key gaps in scientific knowledge about sleep and its import for personality-social processes, aiming to shape future research efforts by scholars in psychology, biology, sociology, and sleep medicine.