land of nod

noun

1. the mythical land of sleep.

noun

1. Old Testament a region to the east of Eden to which Cain went after he had killed Abel (Genesis 4:14)
2. an imaginary land of sleep

To “go off to the land of Nod,” or to “nod off,” is to go to sleep: “What a boring speech! Half the listeners are on their way to the land of Nod.”