This project is an investigation of the development of children’s self-regulation and sleep as predictors of academic and social adjustment in pre-kindergarten (pre-K), and how positive pre-K classroom experiences may optimize children’s academic and social adjustment. Building on self-regulation, sleep, and temperament measures used in our current study of toddler sleep, we will follow children into pre-K. Key components will be measures of pre-K teachers’ perceptions of children’s temperament, behavior, and academic progress, parents’ perceptions of children’s temperament and sleep characteristics, children’s performance in self-regulation tasks, and observations of pre-K classroom processes and children’s engagement in the pre-K classroom.