A curfew is an order that imposes certain regulations during specified hours. Typically, curfews order all people affected by them to remain indoors during the evening and nighttime hours. Such an order is most often issued by public authorities, but may also be given by the owner of a house to those living in the household. For instance, children are often given curfews by their parents, and an au pair is traditionally given a curfew by which time he or she must return to his or her host family's home. Some jurisdictions have juvenile curfews which affect all persons under a certain age not accompanied by an adult or engaged in certain approved activities.