I have had a cough on off for a couple of weeks. I feel fine and can work normally during the daytime. I even do my usual mile swim every day with no problem. But, at night, I cough a lot. I do get some phlegm up. Two days ago, I came down with an ear ache. I went to my ENT doctor and she determined I had a mild sinus infection and prescribed amoxycillin, Amox/K Clav 875-125mg to be taken twice a day. I have taken 2 of them and actually took one more in the middle of the night just now. When I lie down to try to sleep, I have coughing spells. When I am up and not breathing so deeply, I don t cough. I sleep regularly with a CPAP (bi-pap) machine. My ear ache has improved. What could this be? I ve slept quite well, in spite of this, for the last two weeks, but tonight, I have had more severe coughing when I try to go to sleep. I have been sleeping elevated in a recliner.