A cough at night is a sign of congestive heart failure. Backpressure on the aorta will increase the pressures on the pulmonary arteries and veins leading from the heart to the lungs. This is especially true when the person is lining down at night. The lungs are in danger of filling with fluid, which causes the person to cough. Obviously a person should also be assesses for other conditions more closely associated with the lungs.
Reference: Weatherby, D. (2004). Signs and Symptoms Analysis from a Functional Perspective. Jacksonville, OR: Bear Mountain Publishing.
Reference: Weatherby, D. (2004). Signs and Symptoms Analysis from a Functional Perspective. Jacksonville, OR: Bear Mountain Publishing.