I do remember being on holiday once, going out and getting absolutely steaming drunk, then going back to my room, stripping off and going to bed (alone, I might add).
What I don't remember is (I think) getting up in the middle of the night and putting my jammies on because I was cold. It wasn't someone else, because my door was still locked with the key on the inside, and I was on the second floor!
Now, I don't think I had anything like the alcohol you say you've had, so yes, I should think that is the reason you can't remember going to bed.