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Dear editor, I'm writing to talk about the phenomenon happenned to students before exams. As we all know,students want to get good grades.but some students stay up late ,is not a wise chosen.If they can't sleep well,they will have to sleep in class.What a stupid behavior it is.so,I do hope you can advise them to have a good sleep before exams.Only in this way are they bound to get good grades. and I think they shoud make a good arangement to review what they learn before. I hope my suggestions can help them and send my best wishes to them.thanks for you kind consideration.Hope to hear from you soon.