Powered by boffo scores for “Grey’s Anatomy” and “Desperate Housewives,” ABC has captured another Sunday in key young-adult demographics, according to preliminary nationals from Nielsen.

The beginning of Daylight Saving Time, meanwhile, contributed to lower than usual scores for programs earlier in the evening.

ABC won each hour Sunday among adults 18-49, although the 8 o’clock episode of “Extreme Makeover: Home Edition” (4.9 rating/13 share in 18-49, 13.2 million viewers overall) fell to a season low, as did timeslot rivals “The Simpsons” on Fox (4.0/11 in 18-49, 7.8 million viewers overall) and “Cold Case” on CBS (2.7/7 in 18-49, 12.2 million viewers overall).

“Desperate Housewives” (9.0/21 in 18-49, 22.0 million viewers overall) surged from its lead-in to easily win at 9, on par with its recent scores. And at 10, “Grey’s Anatomy” again impressed (9.9/23 in 18-49, 22.4 million viewers overall) and will finish the week as primetime’s No. 1 scripted program in both 18-49 and 25-54.

CBS and NBC aired repeats of crime dramas from 9 to 11, with the Peacock also getting another weak perf at 8 from an original seg of “West Wing” (1.9/5 in 18-49, 7.3 million viewers overall).

Preliminary 18-49 averages for the night: ABC, 6.6/17; Fox, 2.7/7; CBS, 2.5/7; NBC, 1.9/5; WB, 0.8/2.

In total viewers: ABC, 16.4 million; CBS, 10.5 million; NBC, 7.2 million; Fox, 5.4 million; WB, 1.9 million.