I am trying to fight the same problem and first what I did is change to the cable basic channel package. Now I don't have much to zap to. Secondly I  started sorting out my favorite shows in my case the TV is on only when there is a live sports match and when the news are on. This is how TV time decreased in a whole bunch. Place a sign on the screen saying "Read a book instead" or "Don't you have anything better to do?". Also disconnecting like mentioned above helps a lot because before you turn it on you should ask yourself why is it disconnected?