One thing that makes me very happy is to have a complicated idea and to feel that I've expressed myself clearly. I remember writing the ending to 'Happier at Home.' I wrote the entire book to build to that ending 'now is now,' and what I had to say was very abstract, and yet I felt satisfied that I managed to say what I wanted to say.
I embrace treats, but I'm also very wary of treats. Treats help us feel energized, appreciated, and enthusiastic - but very often, the things we choose as 'treats' aren't good for us. The pleasure lasts a minute, but then feelings of guilt, loss of control, and other negative consequences just deepen the lousiness of the day.