"Maybe it is only my problem because I frequently don't sleep very well and on some days am almost too tired to work."

Something is very wrong and must be fixed. Now. Doesn't matter what your work or lifestyle is like. Life (and work) is a marathon, not a sprint.

I don't know if your problem is physical, emotional, psychological, or just plain laziness. It's up to you to find out and fix it. Until you do, I wouldn't bother working on any other problem. You may be surprised what you learn.

Figure out how to start getting a great night's sleep every night, and then figure out how to change the world. Keep us posted. Good luck!