Bunk Bed Size Ideas. Bunk bed sizes. The boys’ bunk room is a study in space planning with a mix of double and twin bunk beds that sleep eight, steps that double as storage drawers and custom wall niches that have their own reading lights and outlets. A John Robshaw throw pillow, a vintage first aid poster and a small child-size chair from Casa Design are amusing accents to the smart red, white and blue color scheme. #BunkRoom #BunkBeds #BunkBedSize Kristina Crestin Design.