CBS dominated its broadcast competition on Labor Day night, as repeats of comedies “The Big Bang Theory” and “Two and a Half Men” ruled as the top programs among young adults.

Overall, though, the holiday proved to be a sleepy one overall, with virtually all repeat programming on the major nets. Things will pick up beginning next week as the CW’s returning dramas “One Tree Hill” and “Gossip Girl” kick off their seasons.

According to preliminary nationals from Nielsen, “The Big Bang Theory” (2.6 rating/7 share in adults 18-49, 7.8 million viewers overall) again grew a bit in demos on its lead-in from “Two and a Half Men” (2.5/7 in 18-49, 8.7 million viewers overall), with the latter standing as the night’s most-watched program overall. Also for the Eye, “How I Met Your Mother” (1.5/5 in 18-49, 4.7 million viewers overall at 8 p.m. and 1.7/5 in 18-49 and 5.0 million viewers overall at 8:30 p.m.) led the broadcast nets during the night’s opening hour, and “CSI: Miami” (1.7/5 in 18-49, 6.4 million viewers overall) won or shared the lead in most categories at 10 o’clock.

NBC grew throughout the night, starting with repurposed episodes of USA drama “Law & Order: Criminal Intent” at both 8 p.m. (1.1/3 in 18-49, 5.4 million viewers overall) and 9 p.m. (1.5/4 in 18-49, 5.9 million viewers overall), followed by newsmag “Dateline” (1.7/5 in 18-49, 6.5 million viewers overall), the evening’s lone firstrun broadcast program.

Fox aired repeats of “House” (1.3/4 in 18-49, 4.3 million viewers overall) and “Lie to Me” (1.3/3 in 18-49, 4.1 million viewers overall), while ABC aired encores of “Castle” at 8 o’clock (0.7/2 in 18-49, 4.1 million viewers overall), 9 o’clock (0.9/2 in 18-49, 3.9 million viewers overall) and 10 o’clock (1.1/3 in 18-49, 4.3 million viewers overall).

Preliminary 18-49 averages for the night: CBS, 1.9/5; NBC and Univision, 1.4/4; Fox, 1.3/4; ABC, 0.9/2; CW, 0.4/1.

In total viewers: CBS, 6.5 million; NBC, 5.9 million; Fox, 4.2 million; ABC, 4.1 million; Univision, 3.6 million; CW, 1.0 million.