Decision fatigue
Decisions cost energy.
Decision fatigue is the danger of moderation. When moderating, you're constantly making decisions (Do you, don't you, do you now, do you later).
Eventually, decision fatigue will set in, and you'll give into your impulses/urges that you're trying to moderate against.
To avoid decision fatigue, minimize moderation, set rules, and build routines. Figure out how to make less decisions.