Some children may play as usual during the day and start coughing at night as soon as they get home and lie down in bed. There are more reasons for this: 1. The first thing to consider is infection. Because they may be more active and distracted during the day, an irritating cough can occur at night when they sleep, especially when their tonsils are inflamed and their tonsils irritate their throat when they lie down. Some children with pneumonia may have a milder cough during the day, so their parents may ignore it or their kindergarten teacher may not notice it, but when they return home, the cough may be more pronounced. In addition, when lying down at night, respiratory secretions are more likely to accumulate, causing the cough to worsen. In this case, you can take your child to the hospital for some tests to look at the tonsils and listen to the lungs for infections. 2. You should consider coughing caused by allergies, especially dust mite allergies, as they are more likely to come into contact with dust mites when sleeping at night, causing the cough to worsen.