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When my health is low and it's not too cold, I sleep in a tent outdoors, for a couple of days. Can be uncomfortable because of the hard surface on the ground, but strangely, my lower back pain disappears. When I come back to my low quality mattress, my back pain comes back, even though it "feels" initially much more confy. The dirty electricity and other radiation at that spot are probably the reason.
I use since many years a pillow made of some hulls (can't remember which grain), like it a lot.
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