Ive got a tiny square room and must fit a king sized bed, a tv, a dresser, bookcase and a desk in it any tips?

Can you build the bookcase onto the top of the dresser or the desk. If it's too tall perhaps cut it into two smaller bookshelves and put on top of the other pieces. Or build shelver over your door and windows to hold items. Instead of a flat headboard build one that will hold items as well. Is there a closet? If so, maybe repurpose it to house the dresser with the TV on top....