Experts call for lifestyle changes as China marks World Sleep Day

While people try various products and services to help them get better sleep, they most likely ignore a key remedy - their biological clocks.

A recent survey shows that online shopping, chatting on social media and enjoying videos form the most popular pre-bedtime entertainment, on which people spend an average of 65 minutes daily.

"These activities cause longtime excitement of the cranial nerves, and in turn cause sleep difficulties," says Gao Xuemei, the vice-chairman of the Chinese Sleep Research Society, which released the survey.