You can Build a Murphy Bed!
Edited #1
Est. 1998 — 27 years of woodworking knowledge
I've actually build 2 Murphy beds
@Sam Force, I've slept many a night on a futon placed directly on the floor on top of tatami mats, or on a piece of cardboard on a dirt floor in a bamboo hut when I ventured outside Japan to less developed Asian countries. The Murphy seems like the perfect solution (to me) for having a real mattress where space is limited. I would even include a shelf that drops down when the bed is up to make a table, making the room--which may be the ONLY room in the house--dual purpose.
We thought of putting book shelves on the front of ours but decided not to because of the extra weight