Shoulder pain from side sleeping is a pressure problem with three inputs: the surface, the pillow, and where your arm goes. Work through them in that order.
Almost every mattress is designed around side sleepers. What front sleeping does to the lumbar spine, why firm plus a shallow comfort layer is the answer, and the pillow trick that helps most.
Medium-firm beats firm in the clinical evidence. How to pick firmness by weight and sleeping position, and the five things that matter more than the mattress itself.
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