Boxetti Private by Rolands Landsbergs. A modular bedroom that includes a double bed, a bedside table, and a wardrobe. Best of all, it can be controlled with a remote control. The full Boxetti collection also includes a foldable kitchen, a living room, and a study desk. http://www.hongkiat.com/blog/creative-furniture-designs/
This is by far the holy grail of space-saving goodness. The Kenchikukagu is a set of mobile furniture that includes a fully functioning kitchen. Take a peep at the video clip below and behold the pieces in action. The set also includes a mobile guest room and work space with lighting. These are not concept designs, and are available at Amazon Japan for JPY 800,000 (about $7,346).