Modern people, especially the young people after 80, 90, are used to night life and staying up late has become a fashionable way of life for them. For them, going to bed after turning the clock is a daily routine, but they do not know that staying up late is harmful to the human body. Occasionally a day of sleep deprivation, the body can be adjusted through self-regulation function. But if often stay up late, the body does not get enough rest, the normal operation of the body will be disrupted, the body’s hormone secretion pattern will also change, affecting the normal operation of human organs, and endanger health, and even lead to death. So, what harm will be brought to the human body by staying up late? The harm to the cardiovascular system Night is the time when the body should rest, if the body can not rest, we must give a certain intensity of stimulation. Some information shows that staying up late can make the average secretion of various hormones in the body 5% higher than the average person, these hormones are like stimulants to stimulate the body to maintain a state of excitement to maintain normal activities, but the increased level of hormones will also bring a series of problems, especially the increase in adrenaline, norepinephrine, will cause vasoconstriction, blood pressure, as well as increased blood viscosity, which may lead to cardiovascular diseases and thrombotic diseases, for patients with cardiovascular stenosis, it may occur heart attack, and lead to sudden death. Harm to the digestive system People who stay up late have the habit of eating late night snacks, we know that the epithelium of the gastric mucosa is generally regenerated once in 2 to 3 days, and this repair time is usually carried out at night when there is no food in the stomach, that is, at night people sleep to repair. If we often snack, or irregular meals, so that the gastrointestinal tract can not get rest, the gastric mucosa can not be repaired and regenerated, over time, it will lead to gastric mucosa erosion, ulcers, can also lead to loss of appetite, indigestion. If not treated in time, it may lead to the occurrence of stomach cancer. A study by Japanese experts found that 38.4% of gastric cancer patients have irregular dinner time. Obesity People who stay up late often eat late night snacks, and these extra added foods are likely to cause obesity. Decrease of immunity Staying up late can make people fatigued, mentally weak, and the body’s resistance decreases, and long-term staying up late can make the body in the subhealthy state. At the same time, the ability to resist various diseases is also reduced, such as: people who stay up late are often prone to colds, gastroenteritis and other diseases. Japanese research concluded that people who stay up late for a long time are more likely to develop cancer than normal people, such as the incidence of pancreatic cancer in people who stay up late is more than 3 times higher than those who do not stay up late. Australian scientists believe that nighttime is the peak of cell fission in the body, if you do not sleep well or do not sleep, it is difficult for the body to control the cell fission, which leads to cell cancer. Memory loss We all have the experience that if we do not have a good rest on the first night, we will have no energy, dizziness, headache, memory loss, lack of concentration, work efficiency and reaction ability will be significantly reduced in the daytime. This is because the body does not get a good rest, stay up late so that the sympathetic nerves should be excited during the day, “overtime” at night to occur abnormal excitement, and in the next day, the sympathetic nerves fatigue, and can not continue to be excited, there will be the above performance. Over time, there will be neurasthenia, insomnia and other serious health problems. Effects on the five senses Staying up late can cause pain and dryness to the eyes, and even cause people to suffer from dry eye, vision loss, central retinitis, etc. It can also cause insufficient blood supply to the inner ear, harming hearing and even leading to deafness. To sum up, we believe that staying up late is a huge health hazard. Every time you stay up late, it is a blow to the immunity of human body and a damage to human health.