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Choosing Between a Bunk Bed and Single Bed When deciding on bunk bed or single beds, it's important to consider the mattress size and the options. Twin mattresses are ideal for adults and children who prefer to sleep on their own. They are best suited to rooms measuring 7 feet by 10 inches. A full bunk that is twin over a bed is ideal for families that have children of various ages. Another popular option is the futon bunk that includes a lower futon that can be converted into a bed. Space Saving Bunk beds are an unique solution for household