Sgeo

The first part may have been a separate dream, and is less interesting. There was a girl in the guy's locker room, which didn't look like a locker room. She refused to get changed, and just put on her good clothing over her gym clothes. Belatedly, I suggested that she get changed in the girl's locker room. As I was leaving, I, out of habit, turned the wrong way and almost walked into the girl's locker room. The girls were naked (there was no door). There was some guy putting a paper sign in front of my face, but I don't think that was related.

There was another part involving another girl, Twitter as some sort of 3d space thing, and broken bones, and some futuristic area.

Now the good part:

I was exploring the school building in a group (that actually happened IRL, so it makes sense. I worked with my computer teacher and some students, going around and doing things such as putting XP on the machines). We came across elevator doors, that looked like they divided the hallway (like a fire door, or those metal things that separate sections of a hall). We, except for one person, went in. Someone pressed a button, despite us telling them not to. The elevator doors (I don't remember if they closed or not), and we saw the elevator, instead of moving up or down, move around (in straight lines) in a weird way, taking us to outside the front of the building. We got out and entered the building, which was my elementary school (I don't think it was the elementary school before, not sure. The elevator was on the second floor the first time, iirc). Things looked normal, until we got some money and the bills looked strange. There was an unfamiliar face on one, and Lincoln's face took up the whole back of another. We surmised that this was an alternate universe. History in the universe was different, but the end result was mostly the same. We might have taken more trips, but I don't remember any details. When it was my turn to choose a destination, I panicked. I brushed my finger over the 1 button, but didn't push. We started moving. We moved past an office and into a library. We thought that this was a "starting animation" or something, but we were wrong. We ended up in the library. I felt that this was the root, and contained the other universes, but I was wrong. I asked if this was the "1" universe, and was told that I was wrong, and possibly was laughed at. The library contained shelves representing each universe, and later had books on each shelf, the subject matters of the book presumably relating to what the represented universe was like. There were 2-3 books on most of the shelves. There was a TV, which was off. There was something somewhere about TVs only in universes that supported them, which to me, heavily implied that there was one library per universe. Then, the librarians got panicky, there was blueness, and it was implied that this universe was going to end. But most people just left the library, and it was just that the library was closing. I left, the library was part of a building, and I went into a corridor with nice windows and a view of the outside, and sloped up at the exits of the corridor, and started typing on my phone.

As I was waking up, I thought that the dream was heavily inspired by a YouTube video featuring that library.. but I think that that's just a fiction. I think.