Codeine / guaifenesin
"I had been coughing for several nights in a row, waking up about 3 times a night and, of course, having trouble going back to sleep because of the cough.  I also had the nasal congestion game going on (i.e., sleep on your left side and the left side of your nose plugs up, roll over, and the right side plugs up).  I hate that game.  I had some Cheratussin AC from last year and I read the bottle.  It hadn't expired yet, one month left.  I took the higher recommended dose (it had two dosages on it, a low and a high).  I went back to bed and slept the entire night through.  This stuff worked great for me and I would recommend it.  I did wake up with a little bit of a headache, but it wore off after coffee and 15 minutes."