Am I Hallucinating?

In this interactive fiction, the narrator begins to hear scratching and footsteps from inside the walls, but assumes the noises are hallucinations from insomnia. However, the narrator soon discovers the noises are not just figments of their sleepless delusion. As the game progresses, the player may or not doubt the innocence of the narrator. The choices that the player makes will determine the eventual fate that the narrator will have to face. There are two different endings. The narrator is not...