One of my best friends as a teenager had a stepdad that was in his fifties. This man was a hard worker, and owned his own construction company. I suppose he was a functioning alcoholic, because he drank vodka all day. He would even wake in the middle of the night and go to his truck and get his bottle. One weekend I was over at my friends house talking to them. His stepdad was sleeping, sitting up in the chair. He suddenly let out a loud moan and started thrashing his legs. Eventually he went back to sleep. They said he had gone two days without drinking. I had never seen that kind of reaction before.