 The population of study will be make for children of both sex, between 3 and 14 years old and with body mass index BMI 95 percentile and with informed consent. METHODS: In all children included in the study, the investigators will carry out: previous history, history of snoring and Chervin s screening questionnaire of SAHS, general physical and otorhinolaryngologic examination with nasopharyngoscopy, blood test with determination of glucose, lipids, insulin, leptin, adiponectin, and ghrelin, polysomnography PSG with transcutaneous CO2. The diagnosis of SAHS will be made if on PSG the Respiratory disturbance Index RDI is 3 andor obstructive hypoventilation is present. 