 The usual arm serves as the comparator arm. The hs dosing and add-on dosing arms test practical strategies that could be tested in a subsequent clinical outcomes trial and that could be implemented in clinical practice. We hypothesize that both arms will reduce nocturnal BP in comparison to usual dosing. We further hypothesize that the hs dosing arm will raise daytime BP somewhat but have no net effect on 24 hour BP and that the add on dosing arm will have no effect on daytime BP but lower 24 hour BP. 