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.
In Don Quixote, Miguel de Cervantes presents the story of a man who becomes entirely consumed by his passion for reading. His obsession leads him to devote all his time to books, reading throughout the night and day without a break. This neglect of rest and balance eventually takes a toll on him.
As a result of his excessive reading, the protagonist's mental state deteriorates. The lack of proper sleep and the overwhelming influx of stories cause his mind to become unhinged, highlighting the dangers of losing oneself in fantasy at the expense of reality.
