Health is mostly a matter of awareness of signs that are all around you and inside you all the time. If you need sleep, then sleep. Know your goals. Make a point of knowing what exactly it is that you want out of life, and what it is that will make you truly happy. Otherwise, you are susceptible to drifting or pirating other people's dreams and not achieving your own happiness.
Acknowledged authority is unnecessary.
You can accomplish anything you want whether other people say so or not, and whether or not you are acknowledged by others to be in a leadership position. All that changes are the tactics. Simplicity in all things. No matter how smart you are, life has a way of operating at the limits of your ability to keep it all straight. Actively pursuing simplicity, and keeping things as elegant and succinct as possible, will help keep your life away from the edge and as in control as you need it to be.