As a child my parents saw a "skill" I had. I can look at a machine and see how it works, and better can "see" what is wrong when the machine is not working correctly. My parents feed that skill with books, models, erector sets and the like.
I have always did the work of service and repair, to this day I love my job. So I do not have the "tired of being tired" thing. My issue has been management, bad or indifferent. I am early for work, do not lay out and do good work, stay late at times as well. This is where I get into trouble, when I need a day off or need to take off early I do, it rubs the boss the wrong way and I get into trouble. That said I just had an yearly eval, got a 2 dollar plus raise and an extra week of vacation.
Enjoy your job and never work a day, or find a skill that you enjoy.