| http://www.w3.org/ns/prov#value | - id, can simply support poor posture rather than allowing the spine to relax and elongate while a person sleeps.He noted that cultures with fewer back problems tend to be those where people sleep on hard surfaces.Henderson did add that firm isn???t always the best, as in the case of those with arthritis or other medical problems that may be exacerbated by sleeping on a firm surface.He echoed Creeks
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