Time to go to bed depends on family but many children in Japan go to bed around 8:00 to 9:00, maybe it is not too late as average, but a little bit late comparing with abroad.
It is surprise that some Japanese children go to bed even later such as 10 or 11:00.
As a result of going to bed late, children are in chronic sleepless without noticing it.
The reason of going bed varies but some says it is because parents work overtime and come home late. We surely need some break both children and adults.