I am no psychologist.But I think it's a good sign. I think it means deep inside you are afraid if drinking again,which is a good thing.
We should never take our sobriety for granted. I used to have a lot of dreams like that (or nightmares). But it's been a while since I had one. The fact that you woke up in a cold sweat kind of sounds like the thought of drinking again had you terrified. So I wouldn't exactly call it a dream. I would call it a very bad nightmare.
Might want to think about what you had to eat before bed. Things like pizza that cause dreams come to mind.
Fred