Refinements to dosing regimens may lead to improved efficacy of antihypertensive treatment. At the 10th Annual Scientific Meeting of the American Society of Hypertension [New York, US; May 1995], several studies were presented that indicated how improvements could be made. According to these studies, physicians should take race into account when deciding upon a dosage regimen, and treatment may be further improved by timing drug delivery according to a patient's body rhythms. There is good news for patients who are fond of an afternoon nap, too. A recent study indicates that the Spanish have got it right, since unlike the period after night sleep, waking from a siesta does not appear to be linked to any significant increase in cardiovascular risk parameters.