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When you are tired from work or study, what do you do? Many people are addicted to coffee for staying alert, or they crave an energy drink to refresh themselves. But one study suggests that a short sleep might refresh you more than a cup of coffee.

Scientists investigated caffeine, which is found in coffee, tea, soda, and energy drinks. They also researched the benefits of napping during the day. Then they compared the effects of caffeine and taking naps. The researche...