Los Angeles Times: NBC is turning to insomniacs to get ratings help for evening news anchor Lester Holt. The network has quietly added second airings of “NBC Nightly News” in overnight time periods on 10 affiliate stations in such markets as Cleveland, St. Louis, Seattle and Atlanta. The sleepless in Seattle and other cities who tune in are being included in the weekly average for the program that is now neck-and-neck with “ABC World News Tonight with David Muir” for the ratings lead.