The more sleep late, the more hasten death day. That many people have heard this sentence. Despite knowing that a lack of sleep. Adversely affect the health of many aspects. But sometimes we can’t avoid stay up late. When sleep disorder. The body is like a machine work all the time without a break. Because of, sleep is the most important activity of man each man took about 1 in 3 with sleep. Most people don't realize the significance of sleep. Because think it's just one activity to do on a daily basis anyway. However, we may expect that our inadequate sleep may affect the immune system of the body's needs. This may cause various diseases such as diabetes, obesity and cancer. In addition, insufficient sleep can affect the functioning of the brain and emotion. By may make us emotionally unstable or condition called attention deficit hyperactivity disorder, etc. Therefore, adequate sleep will be necessary.