Nosebleeds at night are usually caused by damage to the nasal mucosa and rhinitis. 1. Nasal mucous membrane damage: generally due to the nasal mucous membrane damage, and the child will inadvertently rub the nose in bed, or picking the nose, resulting in nasal mucous membrane damage again, thus appearing nosebleeds. 2. Rhinitis: due to the local inflammatory stimulation of the nasal cavity, common allergic rhinitis, sinusitis, etc., leading to the local mucous membrane of the nasal cavity erosion, nasal erosion after the symptoms of nosebleeds. Children with nosebleeds at night, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.