Children sleep at night nosebleed clinically there may be a variety of reasons, clinically summarized the following two reasons are the most common. 1, sleep at night may be very dry air in the house, cover the quilt after the patient’s body temperature rises to appear all over the body to speed up the blood flow. In the northern region of the winter sleeping hot bed, the house has ground heat and so on under the situation is more likely to induce the nasal mucosa dry, dry mucosa in the blood flow speed up the situation is very easy to rupture bleeding. 2, some patients may sleep at night after the bed sheet on the cover of the dust mites and other things have allergies, leading to the patient to appear itchy nose and other uncomfortable. When the patient sleeps, he will involuntarily scratch his nose and rub his nose, resulting in nasal mucous membrane rupture and bleeding, and the site of bleeding is often located in the septum of the nose in the Leigh’s area.