Effect of CPAP Treatment on the Elderly With Mild to Moderate Sleep Apnea

Inclusion Criteria: * Age equal or greater than 70 years of both sexes * Patients with sleep study results with AHI ≥ 15 and \< 30 Exclusion Criteria: * Alternative diagnoses of other non-respiratory sleep disorders that are also cause of pathological somnolence (eg, sdr restless legs, narcolepsy, etc.) * Don't sign informed consent * Acute or chronic respiratory insufficiency requiring home oxygen therapy * Patients with Obesity Hypoventilation Syndrome * Diagnosis of neuro-psychiatric diseases with the exception of anxiety - depression or diagnosis of dementia. * Diseases of any origin in the acute phase * Heart failure or recent stroke (less than 3 months). * Central SAHS (more than 50% of the registry with central apneas or Cheyne-Stokes breathing) * Pre-treatment with CPAP * Inability to perform the diagnostic study of sleep due to the patient's condition * Hipersomniaincapacitante (Epworth≥18) with no known or most likely cause related to SAHS