It could be that your depressed?...sometimes that goes on in your body without knowing it? you may have a pretty rough job physical as well as mental?? if you get your rest after a hard days work 8 -9 hours of sleep and your still feeling tired....go see your Dr. he/she may want to do some blood test....I too was feeling like this and was degnose with Pernious anemia,(B-12 deficency!
only my symtoms was depression tired all the time...sleep almost anywhere anytime,and a tinggling feeling in my neck and fingers, and my equal-librum was off, basicly felt tired all the time/even after I was rested.
but that may not be your case/people are different and I would think diferent symtoms would mean different dignoses?
I certainly hope you don't have the pernious anemia/but incase you do? it can be treated with injections of "cyanocobalamin" that will get you feeling better/at least for me it did anyway!
I have to take the injections the rest of my life because of something in my stomach is missing? instric factor?? or something like that.
Sorry bout my spelling never was good subject for me...lol
Anyway Good Luck to you.