More than 60 percent of children and teenagers in China do not get enough sleep, according to a report released by the Chinese Sleep Research Society on Sunday.

The survey shows 63 percent of children and teenagers in China sleep for less than eight hours a day, the minimum sleeping time to ensure health for such a group, the report said.

The survey, conducted at the end of last year and January this year, covered nearly 70,000 children and teenagers aged 6-17 across China, including Hong Kong, Macao and Taiwan.

Top causes are heavy school work loads and popularization of the use of electronic products, the report said, adding that 8.4 percent of the group are still busy with homework after 11:00 p.m. from Monday to Thursday.