Raised floor, extra space on top, and a pull out bed underneath! Maybe try this to have a guest room/office or playroom?
These space-saving beds from Canadian CabinetBed, Inc are a perfect addition anywhere you need an extra bed but are limited on space. Living in a shoebox
Small Apartment Ideas -- Hide your bed under a raised living area.and i like the projector idea.
The Modern Farmhouse Murphy Bed with Bookcase allows you to save space. It makes your bedroom look more stylish and modern.