The raised-bed-but-not-mattress, which I think you're picturing, definitely exists in the form of bamboo beds/'mattresses', which are just raised platforms of w

The raised-bed-but-not-mattress, which I think you're picturing, definitely exists in the form of bamboo beds/'mattresses', which are just raised platforms of woven bamboo with a little give. They work well in places where a mattress would be quickly destroyed by humidity, but where air conditioning is uncommon (I've seen them in southern China).