WEDNESDAY, May 14 (HealthDay News) -- A daily aspirin can control prehypertension, but only if it is taken at bedtime, a Spanish study shows. An aspirin taken every morning didn't lower the blood pressure of prehypertensive people, but the evening regimen did, Dr. Ramon C. Hermida reported Wednesday at the American Society of Hypertension annual meeting, in New Orleans. A previous study by Hermida, who is director of bioengineering and chronobiology at the University of Vigo, showed the same beneficial effect of bedtime aspirin for people with moderately high blood pressure. The new report is the first study to show...