he became so absorbed in his books that he spent his nights from sunset to sunrise, and his days from dawn to dark, poring over them; and what with l… - Miguel de Cervantes

Finally, from so little sleeping and so much reading, his brain dried up and he went completely out of his mind.

with little sleep and much reading his brains got so dry that he lost his wits.

And thus, from too little sleep and too much reading, his brain dried up and he completely lost his judgment.

...he spent whole days and nights over his books; and thus with little sleeping and much reading his brains dried up to such a degree that he lost the use of his reason.

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In short, our gentleman became so caught up in reading that he spent his nights reading from dusk till dawn and his days reading from sunrise to sunset, and so with too little sleep and too much reading his brains dried up, causing him to lose his mind. His fantasy filled with everything he had read in his books, enchantments as well as combats, battles, challenges, wounds, courtings, loves, torments, and other impossible foolishness, and he became so convinced in his imagination of the truth of all the countless grandiloquent and false inventions he read that for him no history in the world was truer.

debiendo ser los historiadores puntuales, verdaderos y no nada apasionados, y que ni el interés ni el miedo, el rancor ni la afición, no les hagan torcer del camino de la verdad, cuya madre es la historia, émula del tiempo, depósito de las acciones, testigo de lo pasado, ejemplo y aviso de lo presente, advertencia de lo por venir.