RecruitingBehavioural interventionTargeting Insomnia in School Aged Children With Autism Spectrum DisorderChildren with Autism Spectrum Disorder (ASD) and insomnia, and their parent(s) will undergo 4 sessions of behavioral therapy for sleep problems followed by 4 bimonthly booster sessions. Children and their families will be randomly assigned to one of three conditions: cognitive behavioral therapy (in-person), cognitive behavioral therapy (remote), or behavioral therapy (remote). Arousal will be measured through heart-rate variability. Sleep and secondary outcomes (child daytime behavior, parent sleep) will be collected at baseline (weeks 1-2 before starting the treatment), post-treatment (weeks 6-8 from baseline), 6-month follow-up, and 12-month follow-up.