One of the most, Detailed worlds I've ever created and i don't know why i created it. (And a long read about what i was actually dreaming)

I went to bed not intending on LD'ing, but I did a few reality checks before bed. Fast forward into the dream, I'm in a high school walking around. I glance to the left and see my reflection on a glass box. Its distorted that set me off, i looked at some text on a locker and glanced back, it changed. I realised i was dreaming, but this high school i've never even seen it before the lay out was something completely new. So i thought to explore, i walked for about 5 minutes, it was insanely detailed room I walked into classrooms and there were notes written on the boards, Teachers teaching, students listening some even ignoring the teacher. Then as i was walking back to where i started when i saw a kid getting the shit kicked out of him by three guys in a side room. I thought well shit im dreaming why not help out. Busted in kicked some ass but for some reason couldn't resist challenging them to another fight 3v3 fair fight, Scheduled for about 10 minutes later. The kid who was being beat up agreed to fighting. The kid had a face i'd never seen before. But he seemed so real, sorta freaky. This is not my first LD but i hadn't had one this detailed for about a year. The other one had the mood of Alan Wake and was about a girl i knew being involved in a murder mystery. Anyway I found that same girl in my dream highschool and somehow (this parts fuzzy) she was the other person fighting with us. More fuzzy dreams, and were in the halls fighting, we've knocked out two kids and the last one has something now. I think it was a fire extinguisher,

He knocks me upside the head and i black out for a minute and wake up in a bus driving through what i think is Chernarus (been playing a lot of Day Z lately so basically this whole dream was in the world of the game) Back to the bus Im wearing survivor garb with a rifle slung over my shoulder. I glance around looking at the faces of the other survivors, 4 of them are my cousins, 2 of them are the people who fought with me in the high school. Don't know who the driver was, we continue driving till we suddenly stop I hop out its Real not like the game i get up and walk out of the bus i don't teleport out. When we all get out theres a total of around 8 of us pretty well geared. I thought it was awesome, i was gonna get to fight some zombies for real. I notice a pistol on the ground i got to pick it up, when i do its nothing i've ever seen before Called an M9 Hitched Muzzle. Something along those lines. Pick it up turn to try to fire.

Bam im awake. So after all that story time, all i was really wondering was why for one did i think up the high school and two Does that game really influence my dreams that much?