I bet the answer is obvious. If I had to guess it’s because the brain needs to rest.
In: Biology
In addition to the other excellent answers here, if you’ve ever had a concussion you’re likely familiar with the special kind of fatigue that comes with it, even from something as simple as listening to someone talk or watching TV. Your brain does a TON of work even when you’re just sitting around, even if it’s not at all obvious.
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