maybe everyone will feel tired during the work life.
but we should work, we must work, so just accept it as a happy thing.
i am aslo puzzled, feel boring, or not interested in the work sometimes, but the work just there, not change,and aslo can't be change by itself, but we are humen, we have manner, so we can change our thinking mothods.why don't learn a good way to work?
but another hand, if you don't like the substance of work , you can choose another one which you like better. so if the choice is right, the emotion will be better.