Obese children (body mass index (BMI) ≥ 95th %ile for age and sex) 8-17 years old with moderate-severe OSA will be recruited for this study from four pediatric tertiary care centres across Canada. As per current standard of care, those children with moderate-severe OSA, defined as ≥ 10 obstructive events per hour on polysomnography, will be prescribed PAP treatment.