Children with Autism Spectrum Disorder (ASD) and insomnia, and their parent(s) will undergo 8 sessions of Cognitive Behavioral Therapy designed for Children with Chronic Insomnia and ASD (CBT-CI-A). Treatment delivery will be assessed for each session. Treatment receipt will be assessed at the end of session 3. Treatment enactment will be assessed throughout treatment, post-treatment, and follow-up. Sleep and secondary outcomes (child daytime behavior, parent sleep) will be collected at baseline, post-treatment, and 1-month follow-up.