Wild fantasies during the night – do you experience them as well?

So, I am on day 5 of NoFap (I'm using the streak tracking in NoFap subreddit, btw) and I woke up in the middle of the night (around 2~3 AM, I think), the urges were too strong and I kept fantasizing in the night left. I resisted, I clearly know what my goals are – recovering from porn-addiction and also rebooting the reward system in my brain – so I was mentally prepared all the time not to do anything stupid. But the images, the fantasies, lasted all night long and I couldn't sleep :/. I did some research in the morning about fantasies/daydreaming/mentalmasturbation (or whatever is actually used) but couldn't find much information about it. If you relate to at least one of these things, what do you do to keep them away? Can you give me some tips and share you know about this too?
I'm asking cause I don't want to lose another night of sleep again since this will affect me a lot and cause me to become more improductive the next day :/