middle age
during the middle age, the bed usually have wood bed fram and the mattresses filled by the rough straw.
16-18th century
in the 1600s-1800s, Four-poster beds were common, curtain been hang on the for side of the bed. people us coconut fibers, cotton, wool, or horse hair to fill the mattresses. in this time period, there will be many layers of mattresses on the bed, make bed became very thick.
now
the biggest improvement of the bed we use today is the use of metal bed springs.with it, we don't need use ropes or wool straps to support mattresses anymore. today, the four-poster beds are not common, the head and footboard became smaller, the wood bed fram has been replaced by metal bed fram.