From the sheet music at Indiana University:
http://purl.dlib.indiana.edu/iudl/lilly/devincent/printable/LL-SDV-097029-01:


WHIPPOORWILL
Words, Gwen Meredith. Music, Lucien Denni.
Kansas City, MO: Lucien Denni Music Co., 1914.
From the musical comedy "Mlle. Juliette"

1. Why are you silent, dearie?
Whippoorwill, why so still?
Nature is calling, dearie,
Over hill, whippoorwill.
Ev'rything seems so lonely,
Ev'ry rill, whippoorwill.
Come in the treetops and sing to me,
With a trill, whippoorwill.

CHORUS: Sing a lullaby.
Breezes breathe a sigh.
All is still, whippoorwill.
All's asleep.
Sleep so deep.
Sing a lullaby.
Hear my coaxing cry:
Just one sleepy trill,
Whippoorwill, whippoorwill, whippoorwill.

2. Come in the night time, dearie.
Let us fill, whippoorwill,
Woodland with love's old story:
Coo and bill, whippoorwill.
Then when the shadows gather,
We will still, whippoorwill,
Dream in our bird-land some new love notes,
With a trill, whippoorwill.