Decorators are giving the bunk room a modern makeover and creating stylish retreats that guests of all ages—even adults—can enjoy.

take a look at this full-over-full bunk bed. With more than 6,000 reviews (averaging 4.5 stars out of 5), the construction is stable and the mattresses sit on top of sturdy metal slats.

Thin mattresses are suitable for children or smaller adults, and they work well with bunk beds and foldaway beds ... Comfort layers range from 1 to 4 inches thick and are usually made of foam ...