The investigators hypothesize that 1) weight-based opioid dosing compared to dosing based on ideal body weight leads to increased respiratory complications defined by (a) upper airway obstruction, (b) hypoventilation, and (c) oxygen desaturation without affecting pain scores immediately after adenotonsillectomy. In addition, the investigators believe 2) that there will be little statistically significant difference in pain scores between ABW and IBW for these patients.