There were two. A Death Realm, and a Dream Realm. But not like this one.

[Again, she can only suppose.]

It was a little more literal. Each realm basically took you into this dream-like world. Or nightmare. Only then, we didn't really know we were dreaming unless somebody else pulled us out of it.

[She'd had to do that very thing to poor Jack, who had been so happy. To this day, the guilt over destroying his precious illusion continued to haunt her, even though it had been necessary.]