Фото: Алексей Майшев / РИА Новости
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“There’s so much personal preference and variation here,” said Jennifer Martin, PhD, spokesperson for the American Academy of Sleep Medicine and professor at Herbert Wertheim College of Medicine at Florida International University. Side sleepers may prefer something with a softer feel to reduce pressure, she said, but people with back pain “seem to do better” on a firmer mattress.，详情可参考搜狗输入法
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