 - Patients evaluated at the Snoring and Apnea Ambulatory of Hospital de Clinicas de Porto Alegre with clinical complaints related to snoring and sleep apnea with polysomnography held within 90 days before the inclusion, evidencing index of apneahypopnea from 0 to 30 events per hour of sleep snoring , mild and moderate apnea, without showing desaturation below 90 for time periods longer than 60 minutes. 