In a prospective, randomized and controlled study, 40 children with documented obstructive sleep apnea (from sleep study or history obtained from the parent of bothersome snoring, witnessed apnea which interrupts the snoring and/or gasping and choking sensations that arouse the patient from sleep) due to enlarged tonsils and adenoid scheduled for tonsillectomy and adenoidectomy surgery will be enrolled in the study. Children will be randomly divided in two groups of 20 each based on the induction technique used: