Chief among these was a general "reluctance to go to sleep", particularly when computers and addictive social media networks like Sina Weibo and WeChat were always available for easy entertainment.

Later, with a computer, cell phone, WeChat, and become a necessary product of life, nature is also a new carrier of security training.

Jiang Chen's WeChat (Weixin) conversation keeps updating with new messages and he finds it difficult to stop playing games on his computer.