This could be a bunch of different things including smokers cough, post-nasal drip, or even acid coming up the food pipe as it's worse at night. See your doctor about considering these diagnoses and giving you something for it. Over the counter antihistamines could help if this is a post-nasal drip. You can also try an antacid from your pharmacy. This will give you some clues but you may need to see your doctor if this is a sustained problem.
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