There are more types of beds than the basic frame with box springs and mattress. If you have a small bedroom, try a Murphy bed. This is the bed that is hinged and goes up vertical into a cabinet. Another bed type is the trundle bed, which is a regular bed with another bed underneath that can be rolled out when needed. Of course, there are bunk beds for the kids.
I never knew what a futon bed was until I slept in one. It is a wood or metal couch that will side into a regular bed with the regular sofa padding for the mattress. Like a futon is a sofa bed that is a sofa with the bottom opening into a bed with its own mattress.
If you do not want your bedroom to be cluttered with storage areas, there are beds with drawers on the end and sides. Do not forget the headboard with shelves for books.
If the room space is not a problem, a poster bed with four ornate pillars might look good. A canopy bed allows you to drape fabric on the ends and sides.
Now for the ultimate bed. There are smart beds that are coming out now. They adapt to your sleeping positions with temperature controls. They even will make the bed after you get up by using motion rails tied to the sheets. Controls with internet integration allow you to start the coffee maker, turn on the TV, and other things.