can someone in the know please tell me why on earth a dry cough gets so much worse at night / as soon as you lie down. I have tried googling for the answer but can't find anything! i have a terrible dry cough (just gotten over a cold) and it is driving me mad at night, every breath itches my lungs and I have an uncontrollable urge to cough!! Had to sleep propped up last night but it wasn't ideal and the coughing drove me mad!!