People may experience coughing at night — called a nocturnal cough — for multiple reasons. Our bodies naturally cough to protect us by removing mucus and foreign objects from the windpipe, voice box, and lungs. Generally, coughing serves the same function whether it happens at night or during the daytime.
When you are sick, your cough might worsen at night due to postnasal drip. Postnasal drip refers to secretions that run down the back of the throat instead of coming out of the nose. This symptom often accompanies a cold, as well as the flu, allergies, and sinus infections. Lying on your back can worsen postnasal drip, which may be why you notice worse coughing at night.
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