My cough seems to be worse at night, and I was having the same problem with sleeping through the night and sleeping in the mornings. I think it's just by morning you are so exhausted from coughing all night, you just collapse.
I did an open house yesterday, and an RN at one of the med centers here, came through. She told me a coworker of her's has been coughing for 12 WEEKS!!!!! She said the only thing that really seems to work with this crud is the Musinex and Rx cough meds.
Doesn't that just give you warm fuzzies... 
My cough is still here. May possibly be worse. I tried to work yesterday. Any physical exertion resulted in what felt like the coughing up of a lung.
I've been taking Mucinex since yesterday afternoon. I can't tell that it's helped much.
Right now my chest, sides, and stomach are sore from all of the coughing. I'm very, very, very tired. I don't know if it is the Mucinex or a combination of all the coughing or not sleeping.
I have one dose of the Rx cough syrup left. I don't figure the doc would prescribe any more because I went through that bottle much quicker than I should have.
