It is best for children to be at home in the evening.  There is no good reason for children to be out unaccompanied late at night, so a curfew is not really a restriction upon their liberty. Where the child does have good reasons to be out they can be covered by the exceptions. They would be better off at home doing schoolwork, schools often set more than an hour a night which the children should be doing. The time would also be better spent interacting with the rest of their family.