Every night I cough for a while. No cough during the day. What's going on?

Cough every night during the day does not cough, suspected to be chronic pharyngitis is more likely, there may be bronchitis caused, perhaps due to lung infection induced; should go to the regular hospital ear, nose and throat to do electronic laryngoscope examination, if diagnosed as chronic pharyngitis, can use ultrasonic atomization inhalation treatment.