Correlation of the presence of specific sleep disorders with the CVH status as well as with history of stroke or ischemic heart disease will be noted. Procedures that will be used for evaluation of the CVH status and for the diagnosis of stroke and ischemic heart disease will be the same that have been previously used during step one of the Atahualpa Project. In brief, CVH status will be evaluated using the seven metrics proposed by the American Heart Association, stroke will be diagnosed in patients who had experienced a rapidly developing event characterized by clinical signs of focal or global disturbance of cerebral function, lasting ≥ 24 hours, with no apparent cause other than vascular, and ischemic heart disease will be diagnosed if the person is positive by clinical judgment or ECG findings.