According to my chiropractor, matresses generally need replacing after 6-7 years, even with regular turning, due to compression failure in springs and subsequent loss of support. If it sags, its already failed and needs replacement soon.
Any that are independently coiled (coils function independent of one another) is a little more forgiving of use than the regular connected member designs.
I would call up a local chiro you have heard of and trust, to ask for recommendations.
That's Giancarlo (the other thread I haven't attended to yet LOL) problem I think - bad matress and poor core trunk development.


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