I tried to do way to much throughout high school; studying cello, working with my dad and at a part time job, and then spending most of the night programming, and once I graduated and finished the projects I was working on I lost the enthusiasm to start anything else for almost a year.

Sometimes forcing yourself to just do less things and get at least eight hours a day of sleep is the best decision, even if you hate it and lie awake thinking of everything else you could be doing for the entire time. Its better than turning into a world weary introverted otaku. :p