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Doesn't seem like the 45 minutes of sleep I could get if I went to bed right now would be worth it.


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Agreed. If you were only to sleep for 45 minutes all you would do is mess up your cycle. You would have a very difficult time of getting up and gaining momentum again. like DB said, the gym is a must. It should get you recharged.

Also important, do not crash as soon as your classes are over. Try to stay up until you would normally go to bed (or at least an hour earlier than normal). I have found this is the best method to get back on schedule.