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A bed frame or bedstead is the part of a bed used to position the bed base, the flat part which in turn directly supports the mattress(es). The frame may also stop the matresses from sliding sideways, and it may include means of supporting a canopy above. Bed frames are typically made of wood or metal. A bed frame includes head, foot, and side rails. Most double (full) sized beds, along with all queen and king size beds, require some type of center support rail, typically also with extra feet extending down to the floor. The term "bed frame" was first used in 1805-1815. Not all beds include frames; see bed base.