I’ll give you the #1 reason I don’t watch late night talk shows. It reminds me that it’s late at night and that I should go to bed. When it’s late at night, I do NOT want to be reminded of how late it is.
Time is to be ignored in the late evening hours.
That said, a fond childhood memory of mine is being sneaky and watching The Tonight Show with Johnny Carson. In this case, the intent was to watch Johnny Carson with the purpose of knowing that I was staying up late. Perhaps that vivid memory influences my current approach to late night talk shows.