I can understand that you dont have to make physical effort to feel tired, because I work as a computer programmer and I feel tired after making mental effort, but this effort seems way bigger than the one required to drive, yet, after 4,5 hours of driving I feel way more exhausted than after 8,10 hours of coding.
In: Biology
A lot of it is just not moving much for a long time, even though you are sitting longer for your job you have more room to move your legs a bit and can get up regularly, in a car for 4 hours your legs are barely moving and you can’t get up, also the constant concentration is part of it too, at work you likely take small breaks, talk to people, get water but in a car you can’t just stop concentrating for 5 min because you will likely crash
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