 In this study, we will perform a randomized study to evaluate the impact of CPAP therapy on PWV, IMT and CD as well as in catecholamine and C reactive protein. We made the hypothesis that CPAP promotes beneficial effects on atherosclerosis, independent of the other factors, such as blood pressure and cholesterol levels. To this end, we only will study young OSA patients that were free of co-morbidities. Patients will be randomized to no treatment Control or CPAP for 4 months. Evalutations will be performed at baseline and after 4 months. 