NBCenjoyed a strong week in late night for the Nov. 23-27 Nielsen week, while “Good Morning America” notched its third consecutive win over “Today” to finish with a better average for the November sweeps.The ABC-NBC competition for the sweeps in fringe dayparts was also heated in late night, where “Nightline” and “The Tonight Show With Jay Leno” tied for the survey period with a 5.3 rating, 15 share in their common half-hour. Daytime, meanwhile, clearly belonged to CBS, which has now run its record in that daypart to 195 consecutive weekly wins. Ratings there showed CBS with a 5.8 /20 to ABC’s 4.5/16 and a 3.1/11 for NBC. ABC, as usual, led among the key sales demographic of women age 18-49 with a 3.5 rating to CBS’ 3.4 and NBC’s 2.0. Averages reflect preemptions and special programming related to the Thanksgiving holiday. According to NBC research, “Tonight” (4.7/14 overall for the week) had its best rating since July and David Letterman strengthened his negotiating position , as “Late Night With David Letterman” (3.0/14) posted its best numbers since May 25-29. “Nightline” posted a 4.9/13 for the week, while CBS’ “Crime Time After Prime Time” averaged a respectable 3.2/10. “GMA” (4.3/18, with a 1.9/19 among adults 18-49) is firing back at “Today” (3 .9/18, with a 1.6/17 in the key demo), whose executives have been claiming preeminence in the morning wars. ABC’s rating memo points out that the two are tied year-to-date (through 11 months of ’92) and that the ABC breakfastcast has been tied or ranked first outright for 35 of those 48 weeks. “CBS This Morning” (3.0/14, with a 1.1/11 among younger adults) remains in third but continues to show significant improvement over its performance last year. ABC also notes that “GMA” is up 5% over its average for the fourth quarter last year. In Saturday morning, with ABC largely out of the picture due to college football, CBS and the Fox Children’s Network tied in households with a 3.2/11 each. The Eye web ranked first among children age 2-11, with a 5.3 to Fox’s 4.9 and ABC’s 4.2 (to go with a 2.7/10 in households). NBC, with its clearance up to 86% on its 10 a.m.-to-noon live-action block, averaged a 3.1/11 in households for those hours and claimed its best rating of the season among teens. ABC’s Florida-Florida State gridcast tackled a 6.8/20, while NBC hauled in a 12.1/29 and 13.3/26 with its NFL double-header. CBS caught a 13.5/32 for its sole afternoon game.