My buddy lost one of his BP's once and he placed a 10 gallon aquarium in the middle of the room with a heating pad under it and a water bowl inside. Took awhile, but the snake went in when she started getting cold. In your case, I would start by removing as much of the bed as possible and do your best to look under it. BP's(or snakes in general) will surprise you as to where they will hide. The darker and smaller the better. Good luck!