Baseline and Outcome Assessments. Assessments will be conducted at Baseline and at 3 and 6 months post-randomization for all participants. A research assistant blinded to treatment condition will email caregivers at the appropriate time requesting that they complete the assessment, and will follow up by email to answer questions and encourage completion of forms. The primary outcome measures are total sleep duration based on diary data and actigraphy. Total sleep time is the variable most consistently related to improved daytime functioning, both for psychological and physical health. Secondary outcomes will examine change in other sleep variables (i.e., sleep onset and sleep efficiency) as well as change in all sleep variables over the 6-month trial duration, and will include questionnaire measures of children's sleep, caregivers' daytime fatigue level, and children's and caregivers' psychosocial health (behavioural and emotional functioning).