My apologies for the following, but this is something I have never heard of. I have many questions I tried googling but the beds seem to be stone but you then

My apologies for the following, but this is something I have never heard of. I have many questions I tried googling but the beds seem to be stone but you then place a mattress on. Doesn't it hurt your bones when you wake up in the morning? How long have you slept on it? Is it in a frame or straight on the floor? Is your floor specially supported or is it thin like a kitchen bench top?