Lying down without coughing and getting up with a dry cough generally refers to sleeping at night without coughing and dry coughing during the day, which may be caused by respiratory infections, allergic coughs, interstitial lung disease and other reasons. 1. Respiratory system infection: when patients have respiratory system infection, the inflammatory secretions stimulate the trachea-bronchial tubes, thus causing irritating dry cough. When sleeping at night, the cough reflex center is inhibited, which can lead to cough reduction. 2. Allergic cough: When you go out during the day, you may come into contact with allergens, such as pollen and willow, which may cause allergic dry cough, and when you go to bed at night, you are not in contact with these allergens, which may lead to improvement of cough symptoms. 3. Interstitial lung disease: interstitial lung disease due to restrictive ventilatory dysfunction with reduced diffusion function, resulting in shortness of breath after activity, which is manifested as lying down without coughing, and then coughing and shortness of breath after getting up and moving a little. In addition, there are other diseases that can cause the symptoms of nocturnal sleep without coughing, dry cough during the day, if the symptoms do not improve or aggravate, it is recommended that the patient consult a doctor in a timely manner, improve the examination, clarify the cause of the disease, and under the guidance of the doctor reasonable treatment.