Just as a famous saying goes: all work and no play makes Jack a dull boy. It is obvious that people should have adequate rest in order to work hard.
Yet some students especially those who are preparing for the college entrance examination are worried about their lessons and spend all their day time going over them. In their eyes they should sacrifice their rest time in order to get high scores on tests. As a result they suffer greatly from poor health and some of them may do poorly in the examinations.
In conclusion we should be aware that nothing is more valuable than health which is a foundation of one's success. With a poor health one can hardly succeed in anything he does. Therefore as student we should have enough rest to ensure a healthy body to work and study.