A doctor gives instructions of healthy sleeping body position on the World Sleep Day at a kindergarten in Handan, north China's Hebei Province, March 21, 2016. (Photo: Xinhua/Hao Qunying)
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A doctor gives instructions of healthy sleeping body position on the World Sleep Day at a kindergarten in Handan, north China's Hebei Province, March 21, 2016. (Photo: Xinhua/Hao Qunying)
