Platform Beds vs. Fold Away Beds

I've always wanted one of those beds that fold away into the wall. You know, like the one from the 5th Element movie (where Korban hides Vito Corniellious, the priest). The contemporary platform beds remind me of them. Granted - they look much more comfortable than the one from the movie and I don't think they actually fold into the wall but that's the first thought I had when I looked at the