We had a RIDICULOUS amount of chocolate in the house over the holidays, and it was fast becoming a major food group for me. It didn't seem to matter how much I told myself not to eat it, that I was going to regret it later and tried to resist it, I couldn't stop eating it.
Everyone's does, and science shows it. Researchers have found that willpower is a lot like a muscle: It gets tired out and exhausted with repeated use. The more we use it, the less of it we have!