I'm in the process of coming to terms with realizing I am trans (AFAB, realized in my 30s). This past week has been an emotional rollercoaster, and every single night I dreamed I was a man. And I never, ever, ever dreamed I was a man before.
But this has been all that's on my mind, so it's reasonable to assume my brain continues to chew on this while I'm sleeping. FWIW, I don't think I can transition, so the emotions associated are flooding me 24/7.
I wish I could control my dreams

Sometimes dreams just echo the madness of the day. When I used to waitress, I would have those horrendous, "OMG, someone just gave me a table of twenty little kids and my section is already full!" kinds of dreams. So if you're spending a significant amount of time presenting as male, it makes sense that echoes of your daily life would bleed into the subconscious, no great prophecies attached.
I think dreams are like fortune cookies. Every now and then I'll save one and tape it to my computer screen. Most of the time, it's better to just eat the cookie.