Nosebleeds in the middle of the night may be caused by nasal damage, dry environment, some blood diseases. 1. Nasal injury: if children feel nasal congestion or nasal discomfort, they will rub their noses or pick their nostrils, resulting in nasal injury leading to rupture of the nasal mucosal blood vessels, nosebleeds. 2. Dry environment: if the children’s sleeping environment is too dry, resulting in increased fragility of the nasal mucosa, nasal mucosal blood vessels are prone to rupture and bleeding. 3. Certain blood diseases: when children themselves suffer from thrombocytopenia, aplastic anemia and other blood diseases, it is also easier to cause nosebleeds. If children frequently appear in the middle of the night nosebleed, it is recommended to go to the hospital in time for examination and diagnosis, after the cause of the disease is clear for targeted treatment, to avoid delaying the condition, resulting in adverse consequences.