Drinking coffee every night to stay up late can not improve immunity, drinking coffee can only play a certain role in refreshment, if a large number of long-term night drinking coffee may produce certain damage to the body. Immunity is the body’s own defense mechanism, if there is a bad habit of drinking coffee every night and staying up late, may reduce personal fitness, damage to health, such as cerebral insufficiency, visual impairment, digestive tract damage, endocrine disorders, skin damage, etc. 1, cerebral insufficiency: drinking coffee every night and staying up late will make the brain does not get enough rest, the brain is overly fatigued even if drinking coffee to refresh, but also can not Be relieved, in the long run can appear to be insufficient blood supply to the brain. Insufficient blood supply to the brain may lead to memory loss, slow reaction, headache and dizziness and swelling; 2, vision damage: drink coffee every night and stay up late, due to prolonged eye overload, may cause vision loss, myopia, dry eyes, red blood, etc.; 3, digestive tract damage: coffee has a certain degree of stimulation, may stimulate excessive secretion of gastric acid, if you drink coffee every night and stay up late. May make the digestive tract function is impaired, causing indigestion, gastric distension, stomach pain and other digestive tract diseases; 4, endocrine disorders: drinking coffee every night and staying up late may lead to endocrine disorders, due to biological clock disorders, can cause emotional instability, irritability, women are prone to menstrual disorders and other performance; 5, skin damage: drinking coffee every night and staying up late, due to metabolic disorders, pigmentation, may also lead to facial skin roughness, dull complexion and other conditions. Therefore, staying up late every night is more damaging to the body, daily attention should be paid to early to bed and early to rise, to ensure regular rest and rest, to avoid staying up late and other bad habits. In addition, should also avoid drinking coffee every day to refresh, the same will produce certain damage to the body.