Before transition, I almost exclusively dreamed I was male.
During transition, to my surprise, I almost exclusively dream I am in transition. The exceptions are when I dream I am a fully transitioned female or further along in transition.
To my memory, I have not dreamed I was fully male since I began to notice physical changes on HRT. If I did, I was not bothered enough by it to try to remember.
Only once in my life do I recall dreaming I was a cis female. That was pre transition. And gaaaaaaa! I woke the moment I realized I was female. Darn dream!
Before transition, I used to dream a lot about the past. Now I dream in the present. I suspect it has to do with the relative newness of my boobs, and my tendency to still sleep partly on my stomach (I have no clue as to why I still do this or how I manage to do it). I imagine I can feel them even in my sleep, and it is still something I am getting used to.
My dreams are more colorful, and even when abstract, somehow more linear and realistic. They have certainly changed some on hormones.