3 days caffeine-free
I am in my third full day without caffeine and I feel surprisingly good. Last time I kicked the habit (which lasted for 3 years), I had a headache for several days. Of course, back then, I was consuming much more caffeine than I was a few days ago.

There was no real reason for quitting this time. I just generally feel better (both physically and mentally) when I'm not consuming caffeine. Hopefully I can stick to it.