Take exercise. By taking exercise you will increase your chance of a good nights sleep. Its a catch 22 that if you're too tired to do exercise through lack of sleep your sleep will suffer leaving you tired. Stay away from caffeine and nicotine in the evening. If you have ever studied late on an essay that needed to be in the next day then you will know the effect of too much caffeine. Coffee can help keep you up late but it will also leave you feeling like you need a couple of coffees the next morning to get going again.
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