Coughing is a reflex allowing for the discharge, or evacuation, of phlegm or mucous
, by ejecting the air contained in the lungs by exhaling suddenly and forcefully. Coughing is frequently a sign of respiratory condition, but can also indicate other types of diseases. Nocturnal coughing is defined as coughing occurring mostly at night. All kinds of cough can be more or less pronounced at night, but these more particularly indicate the flow of nasal secretion into the throat when lying down, simple symptoms of an often viral infectious disease, asthma
, or gastro reflux, characterized by regurgitation of the stomach's contents.