Today is World Sleep Day

​A child sleeps on a tricycle in Xiangfan city, Hubei province, on May 7, 2007. World Sleep Day falls on Tuesday. About 80% of people have experienced sleeplessness according to a recent survey on sleep conditions among netizens in 362 cities all over China. Shanghai tops the list while Beijing comes in at fourth place. May you sleep soundly on World Sleep Day. [Photo: Youth.cn]