What causes a dry persistent non productive nighttime cough?

Cough. Hello, a cough is a reflex event that occurs after stimulation to the nerves of the airways. A specific night time cough could be due to a few possibilities . First would be a cough variant of asthma. Instead of the wheezing that commonly occurs with asthma, a person coughs instead. My other thought could be from a reflux condition that while you sleep, a small amount of gastric liquid reflexes up.