RecruitingPhase 2Drug trialTrial of Suvorexant for Sleep in Children With AutismThe purpose of this study is to examine the effect of suvorexant on sleep in children and adolescents with Autism Spectrum Disorder (ASD). Suvorexant is a selective, dual orexin receptor antagonist (DORA) used for the treatment of sleep onset difficulties and/or sleep maintenance. To accomplish this, the investigators will use a randomized double-blind placebo-controlled crossover 8-week study design to examine the effect of suvorexant on sleep physiology as assessed by polysomnography (PSG), actigraphy, circadian rhythm, and clinical measures.