RE: I think he went nocturnal......now what?
Just a hunch, but sacrifice the middle of one day. Climb quietly or hang a stand near the thick part he beds in. Don't even get in your stand til about 9:30 AM, and sty in it til aboit 2:30 PM. Nocturnal deer tend to get hungry and mill around in the middle of the day, especially since there aren't many hunters in the woods during this time.