I rarely have them now but when I got out of treatment and my one year was coming up it seemed that I had those dreams on a regular basis and I'd wake up FREAKING out!!!! "OH MY GOD!!!!! I've blown my sober time!!!!" Like really going with it......... calm down in a few seconds and realize it was just a dream.
I think for me it was mostly all the stress of knowing how many people had relapsed when getting out of treatment and as well knowing that, at that time, I was so close to having a year and I didn't want to screw it up.
They are very common, I know that.