If it doesn't work it just means I have to play a game of keep away, and use a bunch of damage wands I have that he doesn't resist.I don't think he's sleep resistant, but I don't think I've ever tried that as a strategy. Be prepared to try something else if it doesn't work. I seem to remember he wakes up pretty easily when he's asleep earlier in the game so maybe he still does.
I lucky I found a second bag of holding before the castle do to a bones file. (I also blessed it before I ever went below the castle). I've been keeping a big old stack of wands in it, and I have 4 tins full of nuse meat as well.
I just have to hope wizard doesn't summon demogorgon.