I found when I cut out my TV viewing I wasn't more productive. I do read more and spend more time playing my guitar, but I don't get more done. However, the big benefit for me was that I got more sleep.

Now if it is 9pm and I'm tired I go to sleep. Hell I'll go to be at 8pm if I'm feeling run down. I've eliminated the primary reason to stay up late -- note: I do occasionally go out with friends...