I remember a time when even 24 Hour TV Stations would still sign off Late Sundays/Early Mondays. It used to be a standard for all TV Stations. I am guessing it was for weekly maintenence? In Northern California in the 1970's, I knew of only 2 TV Stations that stayed on the air Late Sunday Nights/Early Mondays: KNTV Channel 11-San Jose and KEMO Channel 20-San Francisco for ALL NIGHT MOVIES. While KEMO signed off by 6:AM ( a little later when they started airing STOCK MARKET REPORTS), KNTV was a then rare 24/7 TV Station. Soon after KEMO was sold by Leon Crosby to Jim Gabbert, Gabbert continued the ALL NIGHT MOVIES on LATE SUNDAY NIGHTS/EARLY SUNDAY MORNINGS with himself as host of THE SLEAZEY ARMS. Then in 1982, CBS debuted a CBS NEWS NIGHTWATCH on LATE SUNDAYS/EARLY MONDAY MORNINGS. Now very few stations sign off at all.