10-year-old child sleeping nose is not ventilated during the day is fine may be caused by allergies, adenoid hypertrophy and other reasons. 1. Allergy: may be due to the night because the windows and doors are closed, the air quality is not good, clothes, sheets, quilts, pollen in the air, dust mites, animal fur, etc., may lead to the 10-year-old child allergies, may appear to sleep with the phenomenon of the nose is not ventilated, the daytime is fine may be related to the air circulation, the concentration of allergens in the air decreases. 2. Adenoid hypertrophy: may be due to frequent colds and colds, inflammatory stimulation caused by adenoid hypertrophy, sleep at night, the nose may not be ventilated with the position, if the adenoid hypertrophy is serious, there will be the phenomenon of snoring, air circulation during the day will not generally have an impact. Therefore, sleeping nose airless daytime is fine 10-year-old child, should go to the hospital as soon as possible to clarify the cause of the disease, after diagnosis and actively cooperate with the doctor for treatment.