This is an AMAZING suggestion, thank you.
Discussion
you are welcome.
i sleep on something called back supporter spring air.
it is very hard but super comfortable and i can sleep for 8 hours through waking up completely fresh and regenerated.
back supporter mattresses are also available in the usa.
i got mine her for 400 bucks from spring air at costco for a king size.
i had a futon for many years and it feels similar.