I'd like to put out a call for anecdata, if I may:

Lately I've been wondering how much of a causal connection there is between happiness/fulfillment and willpower (or, conversely, akrasia) levels. I feel like I'm not especially fulfilled or happy in my life right now, and I can't help but feel intuitively that this is one cause of the difficulty I seem to have in focusing, concentrating, and putting effort into what I want to. However, I've no idea whether there's actually anything in this.

So: I guess I wondered if anyone has any personal accounts of (medium- to long-term) mood affecting akrasia levels in their own lives? I invite you to share here. (Also welcomed: advice; discussion; pointers to actual, nonanecdotal, study-type data.)