Today's children have a much wider choice and, to be honest, it's so much more functional than it used to be.
Now you can have a bunk bed that has a single bed on top and a double below; called a triple sleeper it's stylish but practical.
Then there's one called the bedsitter bunk bed with room for a desk, chair and even a small wardrobe underneath.

My favourite has to be the pink hideout bed (above) which some people call a cabin bed. So cute!