Good luck.
This reminds me of an experience from my childhood. After watching the finale of Seinfeld, my mother made some kind of comment about how I watched so much TV it was unhealthy. I decided to go a week without watching any television, you know, just to prove her wrong.
And I managed it (admittedly I taped the X-Files to watch after the week had passed. I am unreasonably proud that I went four years without missing an episode even though these days it is trivial to see them all.) It's the first example I can think of where I took an unexamined behavior and made it a deliberate one. It was a good experience to have behind me.
As I understand it, Lent is a holiday where we celebrate the scientific method by changing exactly one variable in our lives for 40 days. This seems like a convenient Schelling point for rationalists to adopt, so:
What variable are you going to change for the next 40 days?
(I am really annoyed I didn't think of this yesterday.)