How to evaluate the delay of class time in primary and secondary schools?

Postpone primary and secondary school classes to ensure that primary and secondary school students have a good and adequate sleep. Let them get better physical growth and think about their health. In fact, this measure is very good for the majority of primary and secondary school students, and having more sleep time and breakfast time can bring good help to their healthy growth. But for primary school students who need someone to pick them up. It may bring some difficulties to parents' work. After all, many units have already gone to work at this time. There is a conflict between school time and work time, which will cause parents to take care of only one, which will affect their children's normal transportation.