A 55-year-old man with a history of stable angina presents to your clinic complaining that his usual chest discomfort has returned despite adherence to a daily transdermal nitroglycerin patch. He reports wearing the same 0.4 mg/h patch continuously for the past 3 weeks without removal. He experiences anginal symptoms primarily early in the morning. On examination, blood pressure is 130/80 mm Hg and heart rate is 70 beats/min. Which of the following is the most appropriate adjustment to his nitroglycerin regimen to reduce development of tolerance and restore efficacy?