Is the story "The Tell Tale Heart" written in sanity? if no then justify your answer.

The protagonist of the "The Tell-Tale Heart" is a classic example of Poe's unreliable narrator, a man who cannot be trusted to tell the objective truth of what is occurring. His unreliability becomes immediately evident in the first paragraph of the story, when he insists on his clarity of mind and attributes any signs of madness to his nervousness and oversensitivity, particularly in the area of hearing. However, as soon as he finishes his declaration of sanity, he offers an account that has a series of apparent logical gaps that can only be explained by insanity. In his writings, Poe often sought to capture the state of mind of psychotic characters, and the narrator of this story exhibits leaps of reasoning that more resemble the logic of dreams than they do the thought processes of a normal human being.