Is Poe's Unreliable Narrator?

Poe does provide a narrator who claims he is not mad but there is signs that provide he is going crazy. In my opinion this makes him an unreliable narrator. We as a reader are not able to trust everything he saying to us since he is saying something but doing another thing. Although we can conclude he is crazy because since the start he said he loved the old man but his eye was evil. He is trying to justify the reason he murdered this old man. Yet, there is no justification for killing that old man. Each night he would watch him sleep and the "vulture eye" could not be seen. He decided to kill him until later on when he wakes him up and was able to see that evil eye. Poe's purpose to make the narrator claim he was not insane was on purpose