The Empty Room

You awake, finding yourself upon a hard, cool, plasticky surface. Placing your hands against the smooth floor you hoist yourself up. There's nothing here. Nothing at all. For you have found yourself in what appears to be a completely empty room. The floor, ceiling, walls - all white. There's not even a visible join between the walls and the floor. Nothing here. No little items, no handy key for escape - nothing at all, but you and the room. So how will you get out?