What are overnights?

Some articles on overnights:

South West Sound FM - Presenters - Networked Presenters
... Sunday) Jim Gellatly (InDemand Uncut) Lynne Hoggan (Friday/Saturday Overnights) Mark Martin (Scotland's Hot 20, Sunday breakfast) Gina McKie (Late ...
WMMX - Former On-air Staff
... Kristi Leigh (Mornings 1991 -2013) Alan Rantz(Middays 2004-06 Also Music Director) Todd Hollst(Overnights 2000-01 Also Promotions Director) Bob Sweeney(Mornings 1993-2005) Chris Collins(Morning Show News Anchor/Co-host 1995-2007 Now at WHIO AM/FM Also does the "Farm Market Report" for NewsCenter 7 at Noon Voice of the WSU Raiders) Andrew Scott(Weekends) Eric Lee(Weekends) Brian Michaels(2001-03 2010-October 2011, host of NightMix) Dan Edwards(Now a news reporter for WDTN-TV 2) Fred Tomlinson(Early 1990s) Dean Taylor(1986–2001 Traffic 2001-07 now at WHIO-TV as Traffic fill-in reporter) Trent Darbee(Overnights 1999-2000) Brian Bruchey(Former Mix Morning Show Producer/Weekends) Sean Roberts(Weekends Now at WABX in Evansville, IN.) Jamey "Flash" Meehan(Weekends) Sandy Collins(Now at WHIO radio, also in Dayton) Kate Burdett(Middays) Joe Thomas(Promotions Director 2000-09, Overnights 2000-01, Fill-In 2000-09) Randy James(Off-the-air Program Director, 1991-94 currently PD of WAKW in Cincinnati) Jeff Ballentine(Off-the-air Program Director, 1994-98) Bobbie Enderle(Promotions Director) Rick LaBeau(Production Director Fill-ins 1991-2012 freelances for the Saturday Nite Mix broadcast, but is no longer officially employed by Mix 107.7/Clear Channel Communications). ...
KSJJ - Current Air Staff - Overnights
... Garner's programs focus on country music hits, along with recent music news and chat about pop culture ... In addition, Blair is recognized as one of Nashville's best interviewers ...
WKXW - History
... into an all oldies format from the 50's through early 70's on overnights and weekends before the change to its current weekday talk format, which came in 1990 when it was sold to Press Communications ... format during the week, with oldies music on the overnights and weekend ... In the late 1990s, music was ended on weekday overnights and now airs strictly on weekends and maybe some holidays ...
Capital North East - Programming/presenters - Networked Presenters
... Sunday afternoon) Will Cozens (Monday to Thursday nights) Andi Durrant (weekend overnights) Adam Inker (Sunday early breakfast) Leigh Jones (Sunday night ...