_Soul of a New Machine_ quotes Tom West, who directed development of Data General's first 32-bit mini, as saying (roughly), The problem with stupid jobs is that they leave you too tired to do anything when you go home. (Adjective not vouched for.)
I feel the same way. The periods when my motivation and thus productivity at work are lowest, my brain's least productive after work. It's because I am consumed by the guilt of not having done my job during the day.
On the contrary when I am productive at work, there's a spring in my step when I go home and my mind is ready to happily tackle new problems.
