Here’s what you’ll learn when you read this story:Combining caffeine with a short nap may boost your energy levels. A 15-minute nap right after coffee offers the way toward a lively evening. The results, published in Psychophysiology, showed that a quick caffeine nap helped drivers stay sharper behind the wheel. “This peak was significantly reduced by caffeine and eliminated by the combined treatment, which reduced incidents to 9 percent of placebo levels versus 34 percent of placebo levels of caffeine alone,” the study authors wrote. So, the next time you’re staring at a long afternoon and evening ahead, the best way to stay sharp is to drink a cup of coffee, then take a nap.