IF YOU’RE ANYTHING LIKE ME, YOU DEPEND on TV to navigate through the week the way sailors once used the stars. But it’s becoming clear that my interior TV clock is rather inflexible. Here it is almost Christmas, and I still get discombobulated every Tuesday when I turn on the set to see Home Improvement. My brain can read the TV listings, but every cell in my body still screams out, “Hey, what’s the big idea? We want Roseanne!” Set the VCR? I can’t even reprogram myself.