After the baseline visit and completion of all preliminary procedures, specific studies for microneurography, plasma renin and aldosterone will be performed. Consequently, a 24 hour blood pressure monitor and a 24 hour urine collection for creatinine clearance, microalbuminuria and proteinuria will be done. Once all the testing has been completed, the patient will be randomized to therapeutic or sub-therapeutic treatment with nasal continuous positive airway pressure for 6 weeks. After 6 weeks of treatment the specific studies, 24 hour blood pressure monitoring and 24 hour urine collection will be repeated.