What’s the deal with the ubiquitous “China Sleep”?

March 21 is "World Sleep Day". Sleep takes up one-third of our lives. Sleep is an important part of the human body's recovery, integration and consolidation of memory.

The ubiquitous "Chinese sleep" is the result of photographer Chu Yongzhi spending decades using his camera to record hundreds of Chinese people sleeping in all kinds of strange ways.

One of the works: On November 6, 2011, at a waste recycling station at the junction of urban and rural areas in the Economic Development Zone of Jiaxing City, Zhejiang Province, a "rag king" slept guarding piles of beverage bottles.