The Daily REST Study at Stanford University invites you and your child to participate in a study exploring the relationship between sleep and mood in adolescents aged 14-21 with and without bipolar disorder. Understanding this link could help advance new treatments to improve life quality for adolescents with bipolar disorder. Our observational study pays up to $215. After eligibility interviews, we will send your child brief text message surveys asking about their mood, sleep, and activities. We also use at-home measures that assess your child's natural sleep quality and patterns. We look forward to hearing from you at dailyrest@stanford.edu or (650) 736-2689.