The reason is not entirely clear. One hypothesis holds that:

来源: 闽姑 于 2014-11-21 09:40:09 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 次 (478 bytes)
回答: 文章提到左侧睡，为什么要左侧睡？ 由 lily60 于 2014-11-21 08:37:01
The reason is not entirely clear. One hypothesis holds that right-side sleeping relaxes the lower esophageal sphincter, between the stomach and the esophagus. Another holds that left-side sleeping keeps the junction between stomach and esophagus above the level of gastric acid.

http://www.nytimes.com/2010/10/26/health/26really.html?_r=0


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