A graveyard slot (or death slot) is a time period in which a television audience is very small compared to other times of the day, and therefore broadcast programming is considered far less important. Graveyard slots are usually situated in the early morning hours of each day, a time when most people are asleep. With little likelihood of a substantial viewing audience during this daypart, providing useful television programming during this time is usually considered unimportant; some broadcast stations may do engineering or other technical work (e.g. software and technology upgrades) or go off the air during these hours, and some audience measurement systems do not collect measurements for these periods. Others use broadcast automation to pass through network feeds unattended, with only broadcasting authority-mandated personnel and emergency anchors/reporters present at the local station overnight. A few stations use "we're always on" or a variant to promote their 24-hour operation as a selling point, though as this is now the rule rather than the exception it was in the past, it has now mainly become a selling point for a station's website or social media apps instead.
Programming
Overnight slot The most well-known graveyard slot in most parts of the world is the overnight slot, the daypart bridging the late night and breakfast television/early morning slots (between 2:00 and 6:00 a.m.). During this time slot, most people are either asleep or working overnight shifts (in some cases, doing so without access to a television set). Because of the small number of people awake at these times, the overnight shift was historically ignored as a revenue opportunity, although increases in irregular shifts have made overnight programming more viable than it had been in the past. In the United States, for example, research has shown that the number of televisions in use at 4:30 a.m. doubled from 1995 to 2010 (8% to 16%); this research coincided with the expansion of early morning newscasts by many local stations during this period.
Network overnight programming The Big Three television networks in the United States all offer regular programming in the overnight slot. Both ABC and CBS carry overnight newscasts with some repackaged content from the day's previous network news broadcasts, with an emphasis on sports scores from West Coast games that typically conclude after 1:00 a.m. ET and international financial markets with the ending of the Australasian (between 12:00 and 4:00 a.m. ET depending on Daylight Savings Time), midway through the Indian (trading ends at 6:15 a.m. ET), and beginning of the European trading day (between 2:00 and 5:00 a.m. ET), while NBC (which dropped its overnight news after an eight-year run in September 1998) replays the NBC News Now streaming news program Top Story with Tom Llamas (previously occupied by a replay of the fourth hour of Today from 2011 to 2022). Each network also produces its early morning newscast at 4:00 a.m. ET (with the exception of NBC's Early Today, which since 2017, has started at 3:00 a.m. ET, acting as a de facto overnight newscast in parlance) so that it may be tape-delayed to air as a lead-in to local news. The graveyard slots' lack of importance sometimes benefits programs; producers and program-makers can afford to take more risks, as there is less advertising revenue at stake. For example, an unusual or niche program may find a chance for an audience in a graveyard slot (a current day example is Adult Swim's FishCenter Live, which features games projected onto the video image of an aquarium), or a formerly popular program that no longer merits an important time slot may be allowed to run in a graveyard slot instead of being removed from the schedule completely. However, abusing this practice may lead to channel drift if the demoted programs were presented as channel stars at some time. The overnight period is also noted for the prevalence of cheaply produced local advertisements which allow an advertiser to purchase time on the station for a low cost, advertisements for services of a sexual nature (such as premium-rate adult rate entertainment services, adult entertainment venues, and adult products from companies such as Adam & Eve), direct response advertising for products and services (often marketed "As Seen On TV") otherwise seen during infomercials, and public service announcements (such as those commissioned by the Ad Council) airing in these time slots due to the reduced importance of advertising revenue.
Time-shifted programming Since the advent of home video recording, some programs in this slot may be transmitted mainly with time-shifting in mind; in the past, the BBC offered specialized overnight strands such as BBC Select (an often-encrypted block providing airtime for specialized professional programmes), and the BBC Learning Zone (which broadcast academic programmes, such as from the Open University). The BBC's current "Sign Zone" strand broadcasts repeat programmes with in-vision interpretation in British Sign Language. Some channels may carry adult-oriented content in the graveyard slot, depending on local regulations. Live events from other time zones (most often sports) may sometimes fall in overnight slots, such as daytime events from the Asia-Pacific region on channels in the Americas, and prime-time events from the Americas on channels in Europe for example. Some anime-oriented streaming services (such as Crunchyroll) have arrangements with Japanese networks to premiere episodes at the same time as their domestic television airings, often falling within the overnight hours in the Americas, particularly Cartoon Network's late night Toonami block on Adult Swim, which airs from Saturday nights to Sunday mornings. From 1988 to 2014 in the United States, some cable networks (such as Nickelodeon, A&E, the Discovery Channel and The Weather Channel) aired educational programs during overnight hours as part of the Cable in the Classroom initiative, intended for educators to tape for later presentation to their students.
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