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This month, tens of thousands of students in area colleges and universities did exactly the wrong thing. To prepare for final exams, they loaded up on caffeine and pulled all-nighters. It may sound like a no-brainer, but research done at the Walter Reed Army Institute of Research says a good night's sleep is beneficial to learning, recall, and performance. And a bad night's sleep? Well, Reporter Andrew Hiller looks into the impact of "sleep restriction."