The idea was for an entity that appears in people's dreams occasionally, hiding in crowds or behind a window of an abandoned building. It isn't able to be contained, because it only exists in people's dreams, but, it could be studied and documented.
The documentation log would become increasingly strange and creepy eventually just becoming NOPE NOPE NOPE just like that.
Maybe it could just be the brain's way of trying to tell you something.
Or, maybe it's it's own entity altogether :/