And, softly dripping, drop by drop,
Upon the quiet mountain top,
Steals drowsily and musically
Into the universal valley.
The rosemary nods upon the grave;
The lily lolls upon the wave;
Wrapping the fog about its breast,
The ruin molders into rest;
Looking like Lethë, see! the lake
A conscious slumber seems to take,
And would not, for the world, awake.
All Beauty sleeps!—and lo! where lies
Irenë, with her Destinies!
O, lady bright! can it be right—
This window open to the night?
The wanton airs, from the tree-top,
Irene  was the original title of the poem. In  Greek mythology  Irene (Eirene) was the goddess of peace and springtime, so Irene could also be a reference to the time of year the poem is set in as well as tying into the metaphor of the sleeper being at peace in death.
The Sleeper