I had the surgery in 2016 also. I produce a lot of saliva when I sleep and I wake up with my head tilted down so I drool out of my mouth. It mostly happens when sleeping but sometimes when I'm awake. Only since the operation. I was in the waiting room once and a man in there had the same problem. Some people get it and some don't. There are some other side effects I've had since but it was still worth going through.