How the brain gets tired from mental work:
The brain uses our body's energy sources, glucose and ATP, even more actively than our muscles!
And at some point the strenuous mental process runs out of ATP. This does not affect muscles and other organs, as they have their own energy depot.
However, the brain notices the lack of energy. This is manifested by distraction, inability to concentrate, temporary deterioration of memory.
This condition can be corrected by a full meal and a healthy sleep, after which the brain "reloads" and is ready to get to work again.
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