How do you keep your energy?
Mz: A) Work on taking better care of yourself so you have more stamina, mental focus, etc (eat right, exercise, stay hydrated, take your vitamins, etc)B) Streamline your life in terms of material things that need upkeep and the like.  If you have less housework and what not to do when you aren't "working", you will have more time, energy and mental focus for side projects.