Do you think it a good habit to stay up late before an exam?Why or why not?

As far as I am concerned,I don't believe that staying up late before an exam is a good idea.
I understand that some students who are lazy and usually don't work hard enough may find their knowledge limited and want to catch up with their study in a few days.
As a result,they make full use of those days before the exam, including the nights,to cram.
Such a way may brings to these students a better result, for they do work hard before tests,however,this method has some problems,too.
Firstly,since they remember so much in such a short time,they will forget what they've learned very soon.
Because of this,if you come across a problem that requries this knowledge in the future,they won't know the answer.
Secondly,and most importantly,staying up late is bad for one's health.
Staying up late can lead to a person feel tired and sleepy for all day,imparing his ability to memorize as well.
Therefore,we should study hard every day if we don't want to be worn out before exams.
Staying up late before exams is burning the candle at both sides,making us exhausted without much help.

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