The main clinical reasons for morning sneezing are as follows: 1. When patients wake up in the morning, during the process of folding the quilt, dust mites and other microorganisms on the bed sheets and pillow sheets float in the air in large quantities, which are inhaled by the human nasal cavity and lead to a rapid allergic reaction in the nasal cavity, resulting in sneezing, runny nose and other related symptoms. 2. 3. When patients wake up in the morning, the breathing speed of the nasal cavity is accelerated, and the inhalation of cold air will also lead to the contraction of the nasal mucosa, resulting in sneezing and other related manifestations. Because the nasal mucosa is most sensitive to the stimulation of cold air, patients need to look for the cause of morning sneezing. If it happens once in a while, it is not a big problem, but if it is always the case, you need to visit an ENT clinic for careful examination by a doctor, and you also need to rule out the possibility of allergic rhinitis and other diseases.