“The sun rises and sets.” This is the result of a long history of human adaptation to the environment. Staying up late can damage your health for fertility function as well. The reason is that both human adrenocorticotropic hormone and growth hormone are secreted at night while sleeping. The former is secreted before dawn and has the function of promoting the body’s sugar metabolism and safeguarding muscle development; the latter is produced only after sleep, which not only promotes the growth and development of adolescents, but also slows down the aging of middle-aged and elderly people. Therefore, the best time of the day to sleep is from 10 p.m. to 6 a.m. Insufficient sleep can cause hormone secretion disorders, resulting in dysfunction of semen affecting fertility. The Chinese medicine thinks: lack of sleep at night can make the body’s yin and yang qi and blood disorder, yang prosperous labor outside, yin and blood can not be guarded inside, there is a yin deficiency internal heat, depletion of the body’s fluid, resulting in thick semen, resulting in poor liquefaction of semen. According to the theory of the meridian circulation in Chinese medicine, 9-11 pm is the time for the immune system (lymph) to detoxify, and this time should be quiet or listen to music. From 11pm-1am, detoxification of the liver needs to be carried out in a sound sleep. 1-3 am, detoxification of the bile. 3-5 am, detoxification of the lungs. Midnight-4 am, blood production in the spine, which must be done in a sound sleep. 5-7 am, detoxification of the large intestine. 7-9 a.m., the time when the small intestine absorbs a lot of nutrients and should eat breakfast. Staying up late will cause a variety of damage to the body: 1, often fatigue, immune system decline: people often stay up late caused by the sequelae, the most serious is fatigue, mental discomfort; human immunity will also follow the decline, colds, gastrointestinal infections, allergies and other autonomic dysfunction symptoms will appear. 2, headache: stay up late the next day, work or class will often have a headache, concentration, and even headache, long-term stay up late, insomnia on memory also has invisible damage. 3, dark circles, bags under the eyes: night is the body’s physiological rest time, the rest and no rest, because of transitional fatigue, resulting in poor blood circulation around the eyes, causing dark circles, bags under the eyes or white eyes covered with blood. 4, dry skin, dark spots and acne: 11 p.m. to 3 a.m. the next day is the beauty time, but also the body’s meridians run to the gallbladder, liver time. These two organs, if they do not get enough rest, will show up on the skin and are prone to roughness, yellowish face, long dark spots and pimples. And, what’s worse, staying up late for a long time can slowly lead to insomnia, forgetfulness, irritability, anxiety and other neurological and mental symptoms. If you have to stay up late, eat more foods rich in vitamin B complex at dinner! Vitamin B complex has many members, including folic acid, niacin, vitamin B6, vitamin B12, etc. They are not only involved in metabolism, providing energy, protecting nerve cells, but also helpful in stabilizing nerves and relieving anxiety. Dark green leafy vegetables and legumes are rich in folates, which help repair cells and prevent infections and anemia; liver, fish, whole grains, soy foods, fruits and vegetables have vitamin B6 or niacin, which can maintain healthy skin and slow down aging; as for vitamin B12, which is related to memory and attention, it can be eaten in red meat, milk and cheese. At the same time need to strengthen nutrition, choose a small amount of high quality protein, fat and vitamin B food such as milk, beef, pork, fish, beans, etc., can also eat some dried fruit such as walnuts, dates, cinnamon, peanuts, etc., which can play an anti-fatigue effect. Staying up late will inevitably affect the time of sexual life. The arrangement of sex life time, usually should consider two issues. One is not in the fatigue of the condition of sex, the second is a more adequate rest and recovery time after sex. From the current practice of sex, most couples are accustomed to the evening time is good. That is, around 22:00, which is the time when a considerable number of people are about to go to sleep. People who hold this view believe that sexual activity requires greater physical effort, during this time to have sex, after finishing can immediately go to sleep, so that both sides get sufficient rest, the next day can keep full of energy. Exertion after staying up late can also affect the quality of sexual life. If you plan to have children naturally, make sure you get enough sleep during the woman’s ovulation period! For those entering IVF cycle, it is better for the male partner not to stay up late for a few days before egg retrieval.