It's amazing to me. When I wake up in the morning and loll around, doing whatever I feel like at the time, I never have motivation to work when it's time to get started. For someone like me, who writes for a living as an aspiring scholar, motivation is everything.
So, this morning, when I wrote about "Tomorrow," after having put it off for some time, I suddenly found myself with all kinds of ideas for blog posts, with motivation to do writing and research, and with energy and focus to do a number of chores I had around the house. And all this because I finally got up the initiative to write a damned blog entry!
This reminds me of a quote from Wendell Berry, though I won't get it just right (nor do I remember the source): Every farmer knows that the motivation to do hard work comes only after the task is begun. I only wish I remembered this more often.
See also this fascinating link from Less Wrong on motivation and procrastination.