Occasionally I use 25mg of Trazodone as a sleep aid (it's not addictive). I've not noticed any difference in dream patterns when I use it and when I don't.
I'd guess that your change in dreams is due to the changes you're making. They should settle down as you get more sober time.
If you think it's the Trazodone, you could talk with your Dr. about your dosage. My Dr. originally prescribed me 100mg which knocked me flat on my butt, I talked with him and and we reduced the dosage. The dose I'm taking does give me a very good night's sleep, without any leftover goggy feelings in the morning.
My Rx runs out soon, and I'm not going to get it refilled. I prefer to not use it, but I do find it useful at this point in my soberity, as a I find a good night's sleep essential for recovery.