Japanese Sleeping Mat I've Seen In Movies Some Japanese People Still Sleep On Mats On The Floor. Is This Okay If You Have A Bad Back?

I've seen in movies some Japanese people still sleep on mats on the floor. Is this okay if you have a bad back? - japanese sleeping mat

I have a slipped disc and complete another CD is in the process of in my back. Since I'm young, I was advised not to proceed with the surgery and could not pay because they already have no health insurance.

I've heard, foam beds, Tempurpedic, or something like that. Would not it be better to have something, or it would be best to start sleeping on a mat on the carpet?

Thank you!