I gave up TV, then qualified for Olympic marathon trials and got my PhD
washingtonpost.com
washingtonpost.com
Much of the time the answer becomes "browsing the internet because I'm bored" and the conscious act of thinking about it allows corrective action to be taken. Even if I don't want to work, I can at least do something constructive like some chores instead of wasting time.
"Between stimulus and response there is a space. In that space is our power to choose our response. In our response lies our growth and our freedom." - Viktor Frankl
Unfortunately, my time is not as fungible as I'd like. The time I used to spend watching TV is instead filled with things not much more productive. I simply don't have the physical or mental energy after 8pm to do much more than read a book, the newspaper or random web sites.