Primary objectives: To determine the efficacy and cost-effectiveness of a management program for patients with obstructive sleep apnea syndrome (OSAS) carried out in primary or specialist healthcare. In the primary arm, the diagnosis and therapeutic decision will be made by means of a domiciliary nasal pressure (DNP) channel and oximetry while the specialist healthcare arm will use polysomnography (PSG) in a hospital. Patients with an intermediate-high suspicion of OSAS will be included, taking as primary variables the Epworth scale, for efficacy, and the Epworth scale and EuroQol 5D, for cost-effectiveness.