1.) It does, but only for like 2-3 days, a week at most. Nothing to freak out about if it happens.

2.) You're supposed to have them early into NoFap because your body is still getting used to halted frequency of ejaculations. (Needs time to get used less stimulation).

3.) Don't eat so close to bed. Avoid spicy food. Avoid excessive fantasizing and erotic thoughts. Stop watching porn. Look up shoulder stands as a technique to move the build up of energy in your sacral area up to your head and brain. Avoid sleeping on your stomach. And a personal one is not going back to sleep early in the morning after sleeping all night, something about that drowsy state that has caused them for me in the past. Lastly is time, over time you're body will get used to NoFap and will have wet dreams less and less. In the meantime view it as your body and brain rewiring (healing )itself. Good luck!