“We first make our habits, then our habits make us.” -John Dryden
Almost anyone who has accomplished something worthwhile had very good habits. The human body relies largely on ingrained actions. They save time and energy and make any task easier. We have only so much willpower. Every decision we force ourselves to make only saps this well a little more. Now, is this trainable? I’m sure that, to some extent, it is. However, as with many things, we may be better off simply keeping the well as full as possible most of the time.
Therefore, try to eliminate as many decisions as possible. Prepare food ahead of time. Develop routines before bed so it becomes easy to go to sleep when you need to and get quality sleep. There are many more, and specifics for everyone will differ. But the important thing is to develop good habits over time, because bad habits become very hard to break.