The following is fiction... maybe.
"How is it that I work fewer hours now than I ever have at any other point in my adult life, and at a job that is pretty easy, and which I enjoy probably more than any other job I've ever had, and yet, every day, once my shift is up, I feel completely drained, and all I want to do is go home and go to sleep in the middle of the day? I mean, I'd like to be more productive, but my body just wants to shut down. I just don't understand why it shuts down so much more quickly these days."
"Welcome to the wrong side of 30," they tell me.
It is true that this "affliction" seemed to begin right after I turned 31, which was also around when I started this job. And yet, that can't be the reason. It should not be the case that a man should become so useless so suddenly with still so many years left to go. I'm not even middle-aged yet! No, rather....
"I'm sorry," I say. "I zoned out there for a bit."
"You've been asleep for two hours."
Yes, it's a workday. That sounds about right.