Rather than sign off in the early pre-dawn hours of the morning (as was standard practice until the early 1970s in larger markets and until the mid-1980s in smaller ones), television stations now fill the time with syndicated programming, reruns of prime time television shows or late local newscasts (the latter becoming less common since the early 2000s), or 30-minute advertisements, known as infomercials, and in the case of CBS and ABC, overnight network news programs.