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In the land of Nod
Metaphorical Nod
In this phrase, 'Nod' does not refer to an actual place, but to a state of sleep or rest. 
Not Literal
Don't misunderstand it as someone actually going to a place called Nod; it's about falling asleep. 
Poetic Use
Often used in a poetic or quaint way to express the idea of someone sleeping. 