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Many students say that they avoid early morning classes so they can get enough sleep to do well. But a study by psychology professors at St. Lawrence University, of students there, finds that the assumption of those who favor sleeping in is only partly correct. The study found that those with later classes indeed get more sleep. But those who get more sleep appear to use their rest to go out more and to abuse alcohol more than do other students. So it is the slightly more tired students who are in the early classes who earn higher grade-point averages, the professors found.