The article "Never Enough? Why Your Brain Craves Stimulation" by Dr. Ellen Littman is a nice explanation in layman's terms of what can go on in the brain. So many tiny neurobiological battles in your head, and each one can be different day to day. The best takeaway from the article is the conclusion of having compassion for yourself on any day that did not go perfectly as planned. Something that looks, to the outside world, like a little "win" can actually be a big "win" to you personally, and worthy of celebration. And tomorrow is always a new day!