In the late evening, just prior to going to bed, and then once in bed for about 1 - 2 hours, I have been experiencing coughing. At first it is whopping / croup sounding, then it starts to get productive . Then it seems as if my lungs start to rattle, creating more mucus that wasn t there before (it seemed) and I continue to cough and cough until suddenly, it s as if it s all out. I ve tried allergy pills. Benedryl. Air purifier all the time. It happens in any season. This has been happening more and more, whereas previously it only happened about 1x a month. What could be the cause?