When the narrator in the raven first hears of the tapping of the raven it's doing what?

The narrator of the poem is full of sorrow, as he is mourning his "lost Lenore" and attempting to distract himself from these feelings by reading an old "volume of forgotten lore." When he first hears the tapping at his door, he tells himself, half asleep ("nearly napping"), that it is only "'some visitor'" and "' ...