In Miguel de Cervantes Saavedra's "Don Quixote," the protagonist becomes deeply engrossed in the tales of chivalry he reads, which profoundly impacts his grasp on reality. His dedication to these books leads him to read day and night, becoming increasingly consumed by their fantastical narratives. As he neglects sleep and engages in this relentless pursuit of knowledge, his mental state begins to deteriorate dramatically.

This obsession with chivalric stories fuels his imagination, ultimately causing him to lose touch with the real world. Don Quixote's transformation reflects the potent influence that literature can have on an individual's perceptions, blurring the line between reality and fantasy. In his quest for adventure, he embodies the spirit of idealism, yet his adventures often highlight the absurdity of his misguided beliefs.