Or Hypnospace. Or Wonderland, the Dreaming, the Oneiros, the Glade of Dreams, the Outback, Nightopia, Oneiroi West, Phantomile, Limbo, the Dreamlands…

And that’s just non-Anime/Manga examples.

I’m partly convinced that, even if not supernatural, there’s something seriously “contrary to the theme of reality” about dreams. By Trope standards, it should be far more niche than it is… unless there’s some truth to it.