Hm.... so doors are a common theme? That is very interesting! Maybe it serves as some kind of marker that spacetime inconsistencies can latch onto. Or...

[She trails off, remembering the few times she had encountered the dream bubbles. She doesn't want to consider the possibility that they're all dead, though.]

Well, I guess we'll just have to do more research and collect more data! That's how science is done, after all.