There are many reasons for babies to cough when they sleep, the specific relief methods are as follows: 1. If the cough is particularly frequent, you can wake your baby up and give him/her the right amount of water to ensure the moisture in the throat and breathing, which will help to relieve the cough. 2. you can feed your baby 1-2 times of phlegm-suppressing medicine, such as aminoglutethimide oral solution. 3. you can give nebulized inhalation treatment during the cough, such as budesonide nebulized solution or depending on whether there is wheezing, whether there is a lot of sputum, etc., then other drugs can be added and nebulized inhalation treatment can be given together. Nebulized inhalation can quickly act on the airway and relieve the dry and sticky phlegm in the throat, which is conducive to the discharge of phlegm and the relief of cough. At the same time, parents can cooperate with the baby to turn over and snap the back, knocking the back from the bottom to the tip of the lungs from both sides, which is conducive to the discharge of phlegm.