I don't know if that's what it is actually called but it seems fitting. In one of my daydreams I thought I'd found a friend but then she tried to drown me (and at the moment I was so lost I thought it was real, like when you are falling in a dream) but then I gasped and sat up and I was sitting at the base of this cool and misty waterfall. That's when I remembered that I was only daydreaming.