Unverified80% confidenceTradeoffTime unknown
枕头的软硬度决定翻身次数：过软下陷会导致颈部悬空代偿性肌肉紧张，助眠效果的核心是让颈椎放松而非单纯柔软，选购应以支撑性优先、表层可略柔软
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80%
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Long-term
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