What are the similarities between Fall of Usher and Sonnet X?

"Sonnet X" shares many similarities with Poe’s “The Fall of the House of Usher”. As in “Sonnet X”, Poe delves into the human mind to investigate its rational and non-rational components. In both stories, the narrator projects a character who is a figment of his imagination in order to represent his non-rational side. In both works, this projection occurs during the rational character's mid-life crisis, thus suggesting that the realization of time's passing affects the characters in such a way that they begin to neglect their non-rational identities. Because they are unable to properly interpret their non-rational counterparts, both rational characters reject them, causing the death of this piece of their identity.