Personally, I think Nocturnal is a Nobody's Listening demo.
It has been discovered that several of the demos on LP Meteora (Shifter, Plaster 2, Husky, Interrogation) were demos. Most likely, Nocturnal will be too
When Shifter and Nocturnal were mentioned, they did so in the following order:
Breaking The Habit, Shifter (From The Inside) and Nocturnal
That's the order of the songs on Meteora; Breaking The Habit, From The Inside and Nobody's Listening.
Also, it should be noted that Nobody's Listening has no known working title, and I highly doubt it was "Nobody's Listening"
It is also possible that it is Numb, but as far as I understand that was a provisional title that stuck (as in the cases of Figure.09, Faint and Session)