Pre-hormones, most of the time I was male, there were a few occasions where I was female, mostly involving dreams about my genitals being in different shapes. I loved those few dreams so much. They were always such a source of joy on the few occasions they happened. My dreams generally weren't pleasant pre-transition, though. I had a lot of nightmares in those days about my hair or teeth falling out, of being chased by wild animals, and of various natural disasters happening to me, specifically giant waves or tornadoes.
When I first started hormones, my dream self evolved into an effeminate in-transition guy, usually someone who was technically male but was wearing more feminine things and acting more feminine. Most of my dreams were just stupid lifey things, but I still had a lot of nightmares happening.
Right before going full-time, my dream self evolved into someone who was trying to pass as female but often terrified that I didn't look feminine enough. I often had dreams where I'd be riding waves in the ocean, and then emerging from the water with my hair flat against my head and having people stare at me, whispering amongst themselves about how I didn't look like a girl. I also had a lot of nightmares about being in the women's bathroom and having people telling me that I didn't belong in there, and I'd have to defend myself, which usually involved hiding my genital anatomy and trying to speak in a higher voice to convince them that I was a girl.
Recently, now about a year and a half of full-time later, I'd say it's about a 50/50 split between feeling more masculine in my dreams and more feminine. There's a lot of times where I have dreams involving my ex-girlfriend where I'll be more guyish in them. I wouldn't say that I'm male in them, because my identity doesn't change, almost always when I'm more masculine in my dreams it involves some sort of distress with my appearance or social role, wishing that I could look or be treated more feminine, or feeling distressed once I wake up. Dreams about the past tend to be this way. And yet at the same time, there's been many times where I'm dreaming about myself back in college or even back in middle school where I'm basically just a younger version of my current self. That has been really cool. I don't have the same nightmares about losing hair or losing teeth or being stuck in natural disasters that I used to. But at the same time, my dream self hasn't quite caught up with my real self completely yet, it's still only about 50% there, and those dreams where I'm more masculine actually still cause me some distress because it feels like being stuck pre-transition again, but it's slowly evolving. For the most part, your dream self tends to be a reflection of your current reality. And since I still spend a lot of time wishing that I looked more feminine, and dealing with the bad memories from my 14 post-puberty pre-transition years, I guess that's why I still have dreams where I'm not.