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Learning user behavior big year accumulated data obtained. The report shows that our students homework average of three hours a day, is the world's number two times were generally sleep less than 7 hours. Among them, the students have written Nanjing Sicheng homework every night 9:00 -10 points, or even 8.89% of Nanjing students to do after 0:00. And stay up all night in Nanjing index was 15.2 percent, or 15.2% of Nanjing students to stay up late at night doing homework to be after 23:00. Accumulated 18 years of homework before the survey of 10,080 hours, the face of many and difficult job, children can only sacrifice sleep time to complete the job. China is the world student day long mean two times the average homework daily sleep time was 1.5 hours less. Survey data show that 26.4% of students homework took 2 hours a day, 44.9% of students took 3 hours, 28.7% of students took four hours. Each day, an average student homework time is 3 hours long, the French equivalent of three times, four times that of Japan, South Korea six times. A reference to the child, nine-month school year, holiday homework time count totaled 300 days, three hours a day, a total of 12 years, to spend a total of more than one million hours. The equivalent of Chinese children by 4032 field work will miss star concert, play less 8985 football match. These students from homework time is sleep time 'squeeze' out, they generally sleep less than seven hours. Staying up until 23:00 sleep students, 18.2% primary school, junior high school 46.3% of high school students is accounted for nearly 9 percent. Women are afraid to mathematics algebraic geometry Male worry hardest subjects survey found that job more difficult and is considered the main cause of student homework yourself late at night. Among them, the mathematics become universal primary headache subjects. But also the men and women in mathematics subjects all have fear. According to statistics, girls generally scared geometry, and relatively coarse heart boys are more unhappy algebra. In addition, in all disciplines blacklist questions, students generally reflect the language difficulty in reading comprehension and writing, mathematical analysis and argumentation in difficult application problems, the difficulty in writing English and cloze. Faced with the job nearly 80% of parents in spite of collapse homework late at night every day, but the survey also showed that nearly 30% of the students every day, unresolved job