I noticed it today - the absence of background noise from the television set.
Something was missing... an element of underlying chaos. It nagged at me ("why is everything so still today?") until I figured out what it was... ahhh!! The TV is off!!
Don't get me wrong - I'm not ready to cancel the cable and sell the set on Craigslist, but as I type this the kids are eating their dinner, and instead of watching the TV, A is teaching J some French words that she's learned in school.
Works for me!