Why do we cough much more during the night?

@kalav56 (11451)
March 4, 2008 9:53pm CST
I have had an allergic cough and I thought it was on its way out.But every night I start coughing badly with an irritation in my throat ,so much so that my son remarked that my night duty had started. I had some hot water and slept better. But, we always tend to cough much more during the night than during the day time.Do you not think so?