Off the wagon...or is it on the wagon?

"Off" the wagon or "on" the wagon: which one means your drunk? After going all day yesterday without drinking, I got thirsty again. I watched the Ashton Kutcher movie, "The Butterfly Effect." You try to watch an Ashton Kutcher movie sober.

However, I am true to my earlier promise of becoming more mature. I was responsible enough to change into pajamas (Adidas shorts and Christie's Cabaret t-shirt) hours ago so that I wouldn't pass out in my clothes. That's something that I wouldn't have done when I was in my 20's.