Teenagers' lack of sleep is mainly reflected in two aspects: First, the proportion of sleeping less than 8 hours on school days has increased by 1 percentage point. In 2009, 47.4% of teenagers slept for 8 hours or more at school, and in 2020, the proportion was only 46.4%. The average sleep time of teenagers in 2020 is 7.8 hours, 0.3 hours less than that in 2009.

The analysis of different periods shows that 95.5% of primary school students lack sleep 10 hour every day, with an average of 8.7 hours; 90.8% of junior high school students sleep less than 9 hours a day, with an average of 7.6 hours; There are 84. 1% high school students who sleep less than 8 hours a day, with an average of 7.2 hours.

Secondly, the length of sleep on school days decreases with the increase of grades, and the phenomenon of sleep supplement on weekends shows the differentiation of school segments. Compared with more than ten years ago, in 2020, the length of sleep of teenagers in various periods showed a downward trend. The average sleep duration in primary school and junior high school is reduced by about 40 minutes, and that in senior one and senior two is reduced by 10 to 20 minutes.

The average weekend sleep time of primary school students is reduced by about 12 to 25.2 minutes, by about 20 minutes in grade one and grade two, and by 40.2 to 5 1.3 minutes in senior high school.

Extended data:

Problems revealed by the report on the development of national mental health in China

In the latest blue book of mental health released on the same day, the sub-report "Mental Health Status and Needs of College Students in 2020" shows that in the survey, college students also generally have the problem of insufficient sleep. Nearly 70% of undergraduates and 50% of college students report that they sometimes lack sleep.

In the first half of 2020, the report surveyed 8447 college students (363 undergraduates1and 48 junior college students16), and found that 90% of college students thought their mental health was good. The evaluation shows that more than 70% undergraduates have no depression problems, and about 90% junior college students have no depression problems. Part of the reason for this difference is that junior college students make better use of interpersonal support to adjust their emotions than undergraduates.

In addition, this report also reminds that this survey found that the mental health of college students is generally good, but there are also some problems such as depression and anxiety that cannot be ignored.

Public trust. Com- the latest survey: More than 80% of primary and middle school students in China don't have enough sleep time.