The feeling of exhaustion, of being "done in" by…

The feeling of exhaustion, of being "done in" by effortful work, is real and anything but rare.

— from Fuel (Energy)

In the book

And even ordinary deciding costs more than we think — self-control and judgment run on a kind of muscle that tires with use, a depletion that makes every later decision worse; the sheer mental energy and stress of deciding what to do, all day long, is a real and rarely-counted cost. The exhaustion of effortful work is not weakness or imagination; it is real, and it is the gauge telling you the truth. Watch for the warning lights of a draining engine — chronic low energy, impatience, defensiveness, a critical and irritable spirit; these are less often character flaws than the symptoms of tanks run dry. — Fuel (Energy)

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