Nosebleeds at night may be caused by overly dry weather, nose picking, or rupture of small angiomas in the nasal cavity. 1. Weather is too dry: If the weather is too dry during the day, resulting in dry nasal cavity, nasal mucosa edema, congestion, or even bleeding, the phenomenon of nosebleeds may occur at night. 2. Nose picking: if the nasal cavity is too dry, the child’s nose scabs, the child sleeps at night with the hand picking the nose, resulting in nasal mucous membrane breakage, it is easy to nosebleed. 3. Nasal cavity small hemangioma rupture: children with small hemangiomas in the nasal cavity, it is easy to rupture and cause bleeding. If a child accidentally picks a small hemangioma in the nasal cavity at night, the symptom of nosebleed will occur. If a child has a nosebleed at night, it may be caused by a variety of reasons, and it is recommended to go to the ear, nose and throat department of a regular hospital as soon as possible for consultation and examination, so as to facilitate a clear diagnosis and take timely measures to deal with the problem.