Like it or not, there is an undeniably high correlation between getting up early and being successful. To take a (very) random sample of creative luminaries from the wonderful Daily Routines blog, Charles Darwin, Toni Morrison, Le Corbusier, Stefan Sagmeister, Benjamin Franklin, Emily Post, Gerhard Richter, and William Wegman all make (or made) a habit of getting up early.
Something about the morning makes me excited and energetic to do something to change the world. The world is perfect before 11 AM, and especially utopian prior to 8 AM. Working to the sun rise is a race to see what you can accomplish before the 1.3 million km giant makes your plans seem worthless.