For sale: Ikea futon/sofa bed.  Folds down to full size bed.  Brown cover is removable, white futon underneath.  Good condition, non smoking house.  Approx. 34"H x 36"D x 73"L when upright.    $30

This one at Ikea is slightly different, but shows the wood slats underneath and how it folds down: http://www.ikea.com/us/en/catalog/products/S29089426/