Most of us in the Western part of the world have only ever slept on a traditional mattress. The often used box-spring and mattress set we almost all grew up with has alternatives. In the Eastern part of world they take a much different approach to sleeping, thinking of it on a more spiritual level, and even a healing and alignment of the body.
The thing about our mattresses is that many of them are simply too soft, not supporting our bodies properly while we sleep. The Eastern part of the world developed their own, simpler style of beds that have the ability to actually re-shape your back. They use a low to the ground platform and place a thinner, denser mattress on top. This mattress is quite firm compared to most any mattress you would find in a furniture store in the United States.