Many houses today have a home office that doubles as a guest bedroom. But when no guests are visiting, the bed sits there, taking up valuable floor space and winds up loaded with books and papers just like a tabletop does. Is there a better way? The answer is a wall bed -- sometimes called a Murphy bed. During the day it folds up out of the way, and the room becomes a regular den or office. At night, when day's work is done or when company comes, with just the touch of a finger, a full bed lowers into place and the room is once again a bedroom. It's a way to make two rooms of one. And that's the On The House tip for today.