"Sleep"

The evening hangs beneath the moon
A silver thread on darkened dune
With closing eyes and resting head
I know that sleep is coming soon

Upon my pillow, safe in bed
A thousand pictures fill my head
I cannot sleep, my mind’s a-flight
And yet my limbs seem made of lead

If there are noises in the night
A frightening shadow, flickering light
Then I surrender unto sleep
Where clouds of dream give second sight

What dreams may come, both dark and deep
Of flying wings and soaring leap
As I surrender unto sleep,
As I surrender unto sleep.

-Charles Anthony Silvestri

"Sleep," unbeknownst to me before wiki-ing it, is an adaptation of Robert Frost's "Stopping by Woods on a Snowy Evening" (no wonder I love it):

Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.

My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.

He gives his harness bells a shake
To ask if there is some mistake.
The only other sound's the sweep
Of easy wind and downy flake.

The woods are lovely, dark and deep.
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep.

And below is a phenomenal choral transcription by Eric Whitacre of Silvestri's "Sleep":