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It has been a long day. You are tired from work and study. What should you do? Many people drink coffee or a power drink. But a new study suggests this. A short sleep might be better than a cup of coffee.

Researchers studied caffeine. Caffeine is found in coffee, tea, and energy drinks. And they studied taking a little sleep during the day. They compared drinking caffeine and taking a little sleep. They wanted to answer a question. What helps learning more, caffeine or a littl...