The term Japanese Sofa Bed is a combination of two words, FUTON (5 letters) and Sofa Bed. A FUTON is a traditional Japanese bedding consisting of padded mattresses and quilts that can be folded and stored away during the day. It is usually placed on a tatami mat, which is a type of straw mat used as a flooring material in traditional Japanese homes. The Sofa Bed is a modern version of the FUTON, which is designed to look like a sofa but can be converted into a bed. It is often used in small apartments or dorm rooms where space is limited.