Dear mother of fresh thoughts and joyous health
A flock of sheep that leisurely pass by 
One after one; the sound of rain, and bees 
Murmuring; the fall of rivers, winds and seas, 
Smooth fields, white sheets of water, and pure sky; — 
I’ve thought of all by turns, and still I lie 
Sleepless; and soon the small birds’ melodies 
Must hear, first utter’d from my orchard trees, 
And the first cuckoo’s melancholy cry.
Even thus last night, and two nights more, I lay,
And could not win thee, Sleep! By any stealth:
So do not let me wear to-night away:
Without Thee what is all the morning’s wealth?
Come, blessed barrier between day and day,
Dear mother of fresh thoughts and joyous health!
William Wordsworth, To Sleep.