I think the most important element for doing anything is to establish a solid reason for it in the first place otherwise you'll never stick to it, period. When it comes to waking up early, my wife is the type to snooze consistently. She'll rollover pretending nothing can perturb her as she does everything to secure the warm underneath the blanket. I on the other hand jolt up the moment my AppleWatch vibrates. Waking up early for me has little to do with all the scientific arguments as to why it's beneficial but if I had to encapsulate my habitual reasoning for 5AM wakeup calls even on my days off, Niklas Göke says it best for me:
I love the quietude of early mornings. The world is asleep, and there’s peace in knowing that alone. But it’s also a great time to read, to learn, and to get things done. There are no distractions. You can be slow and focused at the same time. There’s no rush, and by the time everyone you know has breakfast, you’ve already accomplished a good chunk of what you want to do that day. A half-done to-do list at 9 AM is comforting. Bottom line? I love waking up early.