Get some exercise late in the afternoon or early in the evening, suggest Drs. Neubauer and Soliman. It shouldn't be too strenuous—a walk around the block is just fine. Not only will it fatigue your muscles, but it will also raise your body temperature and may help induce sleepiness as a warm bath would. Exercise also may help trigger the deep, nourishing sleep that your body craves most for replenishment.