Late-night television in the United States

Late-night television is the general term for television programs produced for broadcast during the late evening and overnight hours—most commonly shown after, if not in competition with, local late-evening newscasts; programs that have been showcased in the daypart historically (though not necessarily exclusively) encompassed a particular genre of programming that falls somewhere between a variety show and a talk show. Late-night shows predominantly cater to night owls, people suffering from insomnia, shift workers with irregular schedule assignments, younger male audiences and college students, along with spillover audiences through viewers of entertainment and news programs aired earlier in the evening.

Source: Wikipedia — Late-night television in the United States (CC BY-SA 4.0)