Children’s nose bleeding at night is considered to be due to the dry environment, or may be due to dry rhinitis, acute leukemia and other diseases. 1. environmental dryness: if the night time to open the air conditioning to sleep, will lead to a dry environment, out of the children’s nasal mucosa is relatively thin, there can be children’s nose bleeding at night, if there is no other discomfort symptoms, no need to worry. 2. Dry rhinitis: dry rhinitis may be caused by climate abnormalities, vitamin deficiency, environmental pollution, long-term exposure to dust and other factors. Due to the dry nasal mucosa is easy to cause local mucous membrane brittle cracks, slight nasal action can cause nosebleed situation, manifested in the children’s nose bleeding at night. 3. Acute leukemia: thrombocytopenia is the main cause of bleeding tendency. Skin bruises, bruises and gingival oozing are the most common, and nosebleeds may be present. When irritated by air currents and dust, children may develop mucosal erosions, resulting in nighttime nosebleeds. There are many reasons that lead to children’s nose bleeding at night, parents need to pay attention to this, and actively go to the regular hospital, relevant examination, to identify the cause of the disease.