Coughing before bedtime and not coughing after bedtime are mostly caused by upper respiratory tract infections, bronchitis, lung infections, etc., which are mainly related to the excitability of the cough center in the brain. Upper respiratory tract infections, bronchitis, lung infections and other diseases due to the stimulation of inflammatory secretions can lead to the emergence of reflexive cough. During the day the patient’s brain is awake, the cough center is in a state of excitement, and it is easy to receive feedback, resulting in the patient coughing during the day. However, at night when sleeping, the cough center will be inhibited to a certain extent, the cough reflex is weakened, so the cough is reduced. Coughing before going to bed and not coughing after going to bed can also be caused by other reasons, such as symptoms do not ease or aggravate, it is recommended that the patient to the hospital, improve the examination, under the guidance of the doctor reasonable treatment.