There are actually a lot of ways to structure your life, even your daily routine. I thought I had myself figured out: I was that night-bloomer that takes in information during the day, and then suddenly at night the muse hits and all of the words and music burst forth.
But then just change a couple things. Some stretches, exercises, and meditation in the morning, and then the muse turns on out of nowhere and here are all these morning thoughts and inspirations.
We build all these rationalizations on these subconscious states which seem quite compelling, but really are quite flexible if you know the right adjustments to make. Kind of crazy.
Granted, these life structures, these routines will stabilize over a period of time, both through ageing and repetition through necessity. Nevertheless, it is something to keep in mind when thinking about one's life patterns, and even ideology.