Experts say that students usually need eight to ten hours' sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children study late. They will think their children work very hard. But not all parents are happy about this. Once a mother told us that every morning her 10-year-old boy put up one finger with his eyes still closed, begging for one more minute to sleep. Like thousands of students " early birds " in China, he has to get up before six every morning.

A report shows that without a good night's sleep, students seem to be weaker than they should be. Many students have fallen asleep during class at one time or another. Too much homework is not the only reason why students stay up late. Some watch TV or play the computer games late into the night.

Experts have said that students should develop good study habits. So some clever students never study late, they are able to work well in class.

Self-disciplined （自律的） people are not all great people. But nearly all great people are self-disciplined people. Some of them read every day. Some of them never run late.

The real difference between a great person and an ordinary person is that a great person can manage his or her time well. 【小题1】 What people call self-discipline is in fact self-management.

One example is staying fit. Never underestimate （低估） someone who is in good shape. 【小题2】 It’s even harder to avoid putting weight back on. If someone is in good shape, it shows that he knows the rules of staying fit and is able to stick to a plan that uses these rules. 【小题3】 Whether it is natural or acquired （学习到的）, it is a great skill. It also shows that this person is able to keep persevering （坚定不移的） and can balance long term goals with short-term goals.

【小题4】 First of all, set a goal and write down your reasons for wanting to achieve it. 【小题5】 With self-discipline, small things in life will no longer trouble you. Only through self-discipline can you truly own your future.