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Choosing Between a Bunk Bed and Single Bed When choosing a bunk bed or single beds, you need to think about the mattress size and the options. Twin-sized mattresses are perfect for smaller children or adult single sleepers. They are best suited to rooms measuring 7 feet by 10 inches. Families with children of different age groups can benefit from a full-sized bunk that can be converted into a twin. The futon bunk is a popular option. It comes with a lower Western style futon that can be transformed into a bed. Space Saving Bunk