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Choosing Between a Bunk Bed and Single Bed It is important to consider the size of the mattress when deciding between a bunk bed or one bed. Twin mattresses are ideal for adults and children who are sleeping on their own. They are best suited to rooms that measure 7 feet by 10 inches. Families with children of varying age groups can benefit from the twin over full bunk. The futon bunk is another popular option. It comes with an lower Western style futon that is able to be converted into a bed. Space Saving