2-Year-Old Child Coughs at Night, No Abnormalities Found in Western Medicine Examination, How to Handle?

A 2-year-old child had tonsillitis and after taking Western medicine, switched to Chinese medicine. The cough stopped after two weeks of Chinese medicine, but it started again every evening during afternoon naps. The Western doctor’s examination of the lungs and throat was normal, suggesting no treatment is needed. However, the child coughs frequently during sleep but not during the day, and is in good spirits. Please advise on how to handle this situation?
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