My old roommate would pass out every night drinking a bottle of vodka, then wake up in the morning and resume that same bottle. Didn’t hit me until a while down the road that he was in fact, an alcoholic. I say this because we were in our early 20’s then, and we both drank/partied. It didn’t register with me until started passing out midday or leaving work so he could come home to drink. Thankfully he got the help he needed after going through a divorce, losing his home and being forced to move back in with his parents. Got a big wake up call from it.