Sleep-deprived people often have medical problems,such as high blood pressure,diabetes(a problem with sugar in the blood),and heart problems. It is also more difficult for them to make decisions. Clearly,we need to find time to get more sleep. But there is another reason. A new study from Germany found that sleep makes people smarter. The study shows that the brain continues to work during sleep and helps the sleeper to work on problems. You didn't do your homework last night? Maybe you can tell your teacher that you were working hard in your sleep!