The study will be double blind and consist of two parallel groups. Patients with type 2 diabetes with a creatinine clearance above 20 ml/min and with microalbuminuria or proteinuria who have both resistant hypertension and sleep apnea will be studied. Creatinine clearance and proteinuria will be assessed from a 24 hour urine collection not older than 6 months. Microalbuminuria will be assessed from at least 2 out of 3 positive random urine samples with the last one not older than 6 months. Blood pressure will be considered as resistive to treatment if the patient is on 3 or more antihypertensive medications with blood pressure readings of greater than 140/90 mmHg on the last 2 out of 3 office visits. Sleep apnea syndrome will be defined by the presence of at least 5 apneic or hypopneic episodes per hour during an overnight sleep study.