There are many reasons why 5-year-old children do not wheeze during the day and a little wheezing at night, commonly bronchitis, adenoid hypertrophy, asthma and other diseases. 1. Bronchitis: mostly with pediatric immunity is low, the respiratory system is not fully developed, pathogenic infections caused by its typical manifestations of dry cough, breathlessness, diarrhea and other manifestations. Due to more activities during the day, the breathlessness will not be too obvious, in the night secretion obstruction of the airway, may cause the child breathlessness. 2. Adenoid hypertrophy: there are repeated episodes of acute and chronic inflammation of the throat, stimulating the adenoids lead to hypertrophy, which is one of the most important reasons for children to hold their breath at night. Its typical manifestations are nasal congestion, cough, change in appearance and other manifestations. When sleeping at night, the enlarged adenoids block the airway, leading to respiratory difficulties and the manifestation of wheezing. 3. Asthma: mostly caused by genetic factors, the main symptoms of chest tightness, wheezing, coughing and other manifestations, daytime performance can be normal, but at night the vagus nerve excitation, airway constriction, can lead to wheezing. In short, after the appearance of the above manifestations, should promptly go to the hospital, under the guidance of the doctor for treatment.