I was in a giant library, mostly full of pulp novels and comic books. Some parts of the floors were covered in boxes of books, and constantly moving as if there were conveyor belts underneath, moving the books around under the shelves.
There was also something about being locked in there by a couple people who wanted to kill the two protagonists of this dream for some arcane reasons I cannot remember. We snuck up on one and killed them and took their flamethrower.
Morning came, I and four other people left the library to certain death unless our plan succeeded, and then I woke up with the title track from BÖC's “Fire Of Unknown Origin” in my head.