Children always sleep in the middle of the night nostril blockage, may be due to nasal septum deviation, rhinitis, adenoid hypertrophy. 1. deviated septum: deviated septum is mainly caused by abnormal development of the nasal septum, common symptoms manifested as persistent nasal congestion, therefore, the child’s middle of the night nasal congestion can be considered to possibly suffer from deviated septum disease. 2. Rhinitis: Inflammation of the child’s nose is likely to make the child’s nasal mucosa congested and swollen, leading to an increase in nasal secretions, and when the child sleeps, he or she will experience nasal congestion, creating the discomfort of having the nostrils blocked. 3. Adenoid hypertrophy: Adenoid infection by germs can cause swelling and hypertrophy, which in turn will trigger the child’s nostrils to be unventilated and snoring. If your child’s nostrils are blocked in the middle of the night, it is recommended that you go to the hospital to check the cause of the problem and take appropriate treatment according to the doctor’s instructions.