Sleeping is important for every person and it has become an old topic. We can see a lot of articles about it in newspapers and magazines.

    People say plenty of sleep is necessary for students. However, many students feel drowsy in class nowadays and their study is not efficient because they go to bed too late owing to so much homework. We should do something to stop it for students’ health.

    Of course, homework is not the only thing to blame. You can see students playing mobile phone games, writing on their microblogs and chatting online in the late evening. These students stay up until 1:30 a.m. and get up at 6:30 a.m.

    However, you often find that students who stay up late are energetic all the time while the students who go to bed on time, according to the school schedule, are tired in class.

    Perhaps you will think it strange but it is normal. The fact is that the length of sleep is not the only thing that matters. The quality of sleep multiplied by the length of sleep is equal to enough sleep for a person. Every person’s health is different and their quality of sleep is different, so different people need different lengths of sleep.

    Therefore, students who need more sleep can only admire those who need less because their quality of sleep is better. For a student, it is better to test to see how much sleep is needed. It is of no use to follow and learn from others. For students who feel sleepy in class, try to go to bed early to keep healthy and energetic.