What does the bed and bedroom symbolize in The Tell-Tale Heart?

The lantern used by the narrator is known as a dark-lantern, which means the light can be completely concealed by panels over the sides of the lantern. Because the lantern light is hidden throughout most of the story, and it sometimes only shows a thin ray of light, the lantern could symbolize a lack of insight by the narrator. It guides the narrator to see only what he wants to see, and reveals the old man's vulture eye.