Interestingly enough, I am just *me* in my dreams.
Though I have had a couple that were distinctly me as female.
They are both nightmares of the first order.
In one (which has been recurring a couple of times), I feel my penis pop out. I wake up screaming.
Another one I had just recently, I had a "deflation" on one of my implants and I was trying to get in contact with the doctor to find out how soon I could be seen so that we could schedule a repair... I didn't wake up screaming from that one, but I hated the idea of having a "blow-out".

-Sandy