For all you "night owls" (which I used to proudly call myself), your schedule changes as you age. For me, I would say 40s was the turning point.

As much as I used to love staying up to 3:30am every night, now I like the reverse: Getting up at 5:45am and having a cup of coffee as the sun rises is great. Its the perfect time to exist in quiet, read a bit, work on that complex bit of code/script that you disregarded yesterday.