Most parents and teachers teach kids to work hard. However, working too hard might not be a good idea. Some people even work to death.These people work very late for days and usually have less than four hours’ sleep a day. They always feel very tired and often have a headache or sore muscles. Although they are tired, they have difficulty falling asleep. Then they find it hard for them to concentrate and remember things. These are some warnings from their body, but still, these warnings don’t stop them from working so hard. Finally, their body cannot bear it any longer and they die suddenly.According to a survey, many students in Taiwan went to bed very late. Not all of them stay up to study. Many just spend time on the Net, going through interesting websites, chat, or play games on the Net. This worries their parents and teachers a lot. If these students know what they will pay for their lack of sleep, they’ll go to bed earlier.