"Maybe it is only my problem because I frequently don't sleep very well and on some days am almost too tired to work." If I was you I'd see a doctor about that

"Maybe it is only my problem because I frequently don't sleep very well and on some days am almost too tired to work." If I was you I'd see a doctor about that. Motivation, focus, and energy are heavily influenced by your hormone balance and not sleeping well can affect that. You could have sleep apnea or another medical condition which is causing your fatigue. If you're not doing much exercise that wouldn't help either.