Chances are, you don’t even remember what you ate for lunch three days ago.
Chances are, you don’t recognize all of the good things you’ve done in the past 90 days. However, you can train your brain to notice, focus, and pay attention to the progress you’re making. When you begin seeing progress, you’ll start to feel excited. [...]
Becoming emotionally connected to something is how you begin paying more attention to it. As you engage in something, and begin to identify with it, it becomes a bigger part of your life.
In the book Quiet: The Power of Introverts in a World That Can't Stop Talking, the author, Susan Cain, writes:
Flow is an optimal state in which you feel totally engaged in an activity—whether long-distance swimming or songwriting, sumo wrestling or sex. In a state of flow, you're neither bored nor anxious, and you don't question your own adequacy. Hours pass without your noticing. The key to flow is to pursue an activity for its own sake, not for the rewards it brings...
According to influential psychologist Mihaly Csikszentmihalyi, in flow, "a person could work around the clock for days on end, for no better reason than to keep on working."
There is also hypergraphia, which is the overwhelming urge to write.
And also graphorrhea: writing in excessive amounts, sometimes incoherently.