Night 2 of Fox’s American Idol took an expected ratings hit as the reality show dove into tougher competition on its new night.

The one-hour Idol was seen by 22.9 million viewers and drew a 7.8 adults 18-49 rating — down 20 percent from its Wednesday premiere and dropping 23 percent from its second episode last year. Idol then boosted Bones (10.9 million, 3.6).

Meanwhile, CBS and NBC breathed a big sigh of relief since most of their comedies held up well against TV’s toughest competition, with the time-period premiere of the Peacock’s new Olivia Munn sitcom improving greatly on its December preview.

Big Bang Theory (13.6 million, 4.2) and $#*! My Dad Says (10.3 million, 2.7) were both only two-tenths away from last week’s adult demo rating. Insiders expected Big Bang to hold up fine, but the surprise here is that more CBS viewers didn’t flip the channel to Fox at 8:30 p.m.

Last night marked the debut of NBC airing a whopping three hours of comedy originals. (The network has been running repeats in the 10 p.m. hour as a warm-up.) So how that work out for them? Pretty good, actually.

NBC’s Community (4.7 million, 2.2) matched its season high. Munn’s Perfect Couples (4.2 million, 2.1), while not exactly impressing as a quasi-premiere rating on a Thursday night, was nonetheless up 62 percent from last month’s holiday week preview.

At 9 p.m., The Office (8.3 million, 4.5) hit a season high. Then the return of Parks and Recreation (6.2 million, 3.2) hit a series high — and definitely improved on the usual performance of Outsourced in the slot. At 10 p.m., 30 Rock (5.3 million, 2.7) improved its half hour. The only bummer in the lineup was Outsourced (4.0 million, 1.8), which fell notably at 10:30 p.m. from its lead-in.

Also Thursday, CSI (14.3 million, 3.1) and The Mentalist (14.7 million, 2.8). ABC had Wipeout (8.3 million, 2.6) and repeats.