We often see that college students in China are drowsy when they are in class. It looks like no spirit. I'm one of them, too. It's always going to stay up late last night. Actually did not do anything meaningful, sometimes just aimlessly watching mobile phones, brush micro-blog. It does great harm to the body, but we still do. I think this kind of sleeping concept is wrong. The body is very important. Without it, many things can not be completed. When we are ready to play mobile phones, we can think of our bodies. In this way, college life is better.