Current guidelines recommend adenotonsillectomy (T+A) as primary and effective therapy for sleep apnea resulting in polysomnographic resolution in 75-100% of patients. Small studies have shown that T+A relieves symptoms in obese children but surgical intervention has been less efficacious in adults . Although nocturnal polysomnogrpahy (NPSG) is considered the gold standard by which to diagnose obstructive sleep apnea (OSAS), published studies assessing the efficacy of treatment in obese children using polysomngraphy to objectively quantify the degree of sleep apnea before and after T+A do not exist.