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
Driving is incredibly complex. Your brain is doing a lot of work to coordinate position, speed, actions of others, obstacles, road conditions, as well as the placement and movement of all 4 limbs, among a plethora of other things. Your eyes are also open more, you blink less, so they can get dry.
So your mind is working now, so gets tired. And your eyes are getting dry, making them tired also.
(The sheer complexity of driving is why you should never allow yourself or others to be distracted while driving. Put that phone away.)
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