When curfew was first used in the 14th century, it referred to the sounding of a bell at evening to alert people that they should cover their hearth fires for the night—a necessary warning, as many European houses in the Middle Ages were close enough to each other that fires could spread easily from one to the next. The word came to English from Anglo-French, in which the signal was called coverfeu, a compound of covrir, meaning “to cover,” and feu, “fire.” Even when hearth fires were no longer regulated, many towns had other rules that called for ringing an evening bell, including one that required people to be off the streets by a given time, a development that granted curfew permission to go out and about with a broader meaning.
Don't ask me who's influenced me. A lion is made up of the lambs he's digested, and I've been reading all my life. -Giorgos Seferis, writer, diplomat, Nobel laureate (1900-1971)