This just struck me today. Perhaps this gal (Yup, her again. Mainly because I love her writing style, she's an awesome runner, and she has this crazy positive outlook on life that I can't help but want to adopt!) is rubbing off on me. I think my quest also has a huge factor in my starting-to-be-more-positive-about-everything lifestyle. I credit the endorphins too.
Anyway, just a thought for your Thursday evening: When you wake up tomorrow, be grateful. See how your day changes.