be in the land of nod
be in the Land of Nod
To be asleep. The phrase likely alludes to how one's head nods when one is falling asleep. I would have told you this last night, but you were already in the Land of Nod, and I didn't want to wake you.
be in the land of nod(old-fashioned)
to be sleeping Joe's in the land of nod at last.