Oh my gosh! I have been having these as well. I have dreams that I was drinking and then I will wake up and be like... "Ugh, I failed myself..." and I feel horrible, then it takes a second then I remember... wait, no I didnt.
I think it is just that you dream about what you think about... in my case my new found sobriety and thinking about my life when I was drinking has been on my mind a lot lately.
Your not alone...