A four-week, randomized, controlled, open-label trial of DR prednisone in which patients receive in period 1 one of three-night time doses of treatment (4mg, 7mg or 10mg) for two weeks followed in period 2 by treatment with 15mg IR prednisone in the morning for two weeks. Period 1 is randomized and open-label and period 2 is open label. Before enrollment and randomization patient diagnosis and responsiveness to 15mg IR prednisone in the morning is established. 45 patients will be randomized, 15 patients in each treatment arm.