"Do Not Disturb": Not many checking in; Obama appearance scores for Letterman

Yikes. Rough start last night for Fox's new sitcom "Do Not Disturb."

Show that was pretty well batted around by crix drew 4.9 million viewers and 2.0 rating/5 share in adults 18-49 in the 9:30 p.m. berth, according to prelim Nielsens. "Do Not Disturb" sank from its "Til Death" lead-in (6.4 mil, 2.4/7), which in turn gave up significant ground from a solid lead-in from 8 p.m. drama "Bones" (8.9 million, 2.9/8).

"Do Not Disturb" wasn't quite in "Anchorwoman" territory -- the comedy Fox yanked after one woefully low-rated airing last August -- but it's not a promising preem, by any means.

Overall, NBC won the night with another two-hour installment of "America's Got Talent" (11.5 mil, 2.8/8).

Meanwhile, in late night, Barack Obama's visit to "The Late Show with David Letterman" pushed Letterman to a narrow win over "The Tonight Show with Jay Leno." "Late Show" polled a 4.1 household rating/10 share in Nielsen's 55 overnight metered markets to "Tonight's" 3.9/10. Craig Ferguson's "Late Late Show" squeaked past "Late Night with Conan O'Brien" by an even tighter margin (1.9/7 vs. 1.8/6).