Elizabeth had it right except for the last line, the whole song goes as follows;

There's a whipporwill sweetly singing in the vale tonight,
whipporwill, whippoorwill.

He's singing a song that makes for home tonight,
whippoorwill, whippoorwill.

Singing 'bout the honeysuckle 'round the cabin door,
Seems to be saying someones praying
You'll come home once more.

There's a whippoorwill sweetly singing in the pale moonlight,
But now I know, it's time to go, whippoorwill
      

Hope this is what you're looking for.