Middle-earth is the setting of much of J. R. R. Tolkien's legendarium. The term is equivalent to the term Midgard of Norse mythology, describing the human-inhabited world, i.e. the central continent of world of Tolkien's imagined mythological past. Tolkien's most widely read works, The Hobbit and The Lord of the Rings take place entirely in Middle-earth, and Middle-earth has also become a short-hand to refer to the legendarium or its "fictional-universe".
Within his stories, Tolkien translated the name "Middle-earth" as Endor (or sometimes Endórë) and Ennor in the Elvish languages Quenya and Sindarin respectively, sometimes referring only to the continent that the stories take place on, with another southern continent called the Dark Land.
Middle-earth is the central continent of Earth (Arda) in an imaginary period of the Earth's past (Tolkien placed the end of the Third Age at about 6,000 years before his own time), in the sense of a "secondary or sub-creational reality". Its general position is reminiscent of Europe, with the environs of the Shire intended to be reminiscent of England (more specifically, the West Midlands, with Hobbiton set at the same latitude as Oxford).
Used to sleep through the night peacefully
Not a care in the world got to me
But now I lay me down to sleep
I'm afraid of what I might see
I wake up screamin' when your dream goes by
Used to feel like a man in control
Unaware of the storm in my soul
The sight of you took away my breath
I wake up screamin' when your dream goes by
Now in this dream I'm in a room
All dressed up just like a groom
Watchin' shadows dance in the ledge
Suddenly you then appear you whisper in my hear
And I jump right over the edge
Just a dream that I seem to recall
Can't you tell me which doctor to call
Tell him please I'm not feelin too well
Everynight I'm hearin' wedding bells
I wake up screamin' when your dream goes by
I lay there in an ice cold sweat
Sheets are torn and they're soakin' wet
I wake up screamin' when your dream goes by
I wake up screamin' when your dream goes by