Originally, the night is used for sleeping and allowing the brain and body to get recharged. During the night time, the blessed cross nerve is at its most dominant and active state. It causes the body temperature to slowly drop, allowing the body to relax and go into sleep mode. This is the physiological law of the human body. However, as health care workers, often on night shifts, staying up late is inevitable. However, if we stay up all night without sleeping, we will break this balance. Once it becomes that we want to sleep during the day and do not want to sleep at night, the autonomic disorder will be more serious. As a result, endocrine disruption will follow, so people who stay up late appear to be aging and detrimental to their health. It is important that you do not break the balance of the body. Some people often go to bed past 2:00, but as long as the routine and also sleep well, then there is nothing wrong with health. However, there are many night owls who say that they use their holidays to catch up on sleep. This is a big no-no! Sleep time, you can not rely on as long as make up a week of time to calculate the way. The lifestyle of not sleeping enough during the week and sleeping a treasure on the weekend can disrupt the sleep cycle. Just take a short nap during the day when you want to sleep. Never have the idea of catching up on sleep during the holidays. Remember, for good health, then maintain a healthy and regular sleep cycle.