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Mattresses Double Double beds (also known as full mattresses) were the only mattress sizes available prior to the time queen and king mattresses became popular in the 1950s. They are great for rooms with small spaces that need a cozy sleeping space without taking up too much floor space. They are easily accessible on the internet. They are ideal for teenagers as well as adults who live on their own. Comfort A comfortable bed is the key to a peaceful sleep. Mattresses double are designed to be comfortable.