Lots of pictures of great ideas for space saving beds, including murphy beds "Here’s another quick alternative, featuring a concertina design, which you can hide into other pieces of furniture like wall units.
Handmade Modern: A Lofted Bed You Can't Find In Store - What a great way to save space with multiple use functions. All kids love bunkbeds. My child has a full size bed and complete bedroom suite and would rather have this, haha!
Space Saving Beds: 10 Must Sees for Apartment Dwellers