Conversation so far:
What were the ratings like for The Jay Leno Show?
The first episode of The Jay Leno Show earned fast national estimates of 17.7 million viewers, an 11 Nielsen rating and an 18 share.
Did the ratings for The Jay Leno Show change?
By the second week and competing against season premieres, the audience fell to six million viewers, still on par with or exceeding NBC projections.
Did it get more popular as The Jay Leno Show went on?
Prior to the controversy regarding the move of the Jay Leno Show to 11:35 p.m., viewership bottomed out at 4.799 million viewers.

Question: Was there a reason for this?
Self-contained rewrite: Was there a reason for the viewership of The Jay Leno Show bottoming out?