Research demonstrates that circadian rhythm dysfunction is highly prevalent in ADHD, with up to 80% of adults and 82% of children experiencing sleep disturbances, delayed sleep-wake timing in up to 78%, and DLMO delays of 45-90 minutes. Intervention studies show that circadian phase advancement through melatonin, bright light therapy, and behavioral modifications like fixed wake times and morning light exposure can improve ADHD symptoms. The authors propose a behavioral-first clinical pathway incorporating routine screening, chronotype assessment, and selective low-dose melatonin for ADHD management.