The older form 牀 combines 木, “wood,” with 爿, which mainly supplied its historical sound and may itself have been linked with a split wooden board or frame. 床 later became the standard form, with wood beneath 广, “shelter.” That modern arrangement is a useful memory picture, but this ancient-form-inspired sketch shows a wooden resting frame without pretending that the character began as a simple bed drawing.
A piece of culture
A bed that warms the room In northern China, a kang (炕) is a heated platform used for sitting and sleeping. Heat from a stove or flue passes beneath its surface, turning the sleeping place into a warm centre of household life during cold winters. Designs and everyday uses differ by region and family.