Posted too late last night and have included the whole bothy ballad version here with corrected penultimate verse.
Jim Carroll

I'M A ROVER.
This night-visit song is almost certainly related to The Grey Cock (The Lover's Ghost), a ballad in which a girl is visited by the ghost of her dead lover. As A. L. Lloyd has observed: "Generally the song is found either with the bedroom-window theme or the cockcrow theme but not the two together. In this version the bedroom-window theme is clearly established and what remains of the cock-crow theme has lost its supernatural significance.

I'm a rover and seldom sober,
I'm a rover of high degree,
It's when I'm drinking I'm always thinking
How to gain my love's company.

'There's ne'er a night I'm going to ramble
There's ne'er a night I'm going to roam,
There's ne'er a night I'm going to ramble
Into the arms of my own true love.

Though the night be as dark as dungeon,
Not a star to be be seen above,
I will be guided without a stumble
Into the arms of my own true love.

He stepped up to her bedroom window,
Kneeling gently upon a stone,
He whispered through her bedroom window,
"Darling dear, do you lie alone?"

She raised her head on her snow-white pillow,
Wi' her arms around her breast,
Says, "Who is that at my bedroom window
Disturbing me at my long night's rest?"

Says I, "True love, it's thy true lover,
Open the door and let me in,
For I am come on a long journey
More than near drenched to the skin."

She opened the door with the greatest pleasure,
She opened the door and let him in:
They both shook hands and embraced each other
Till the morning they lay as one.

The cocks were crawing, the birds were whistling,
The burns they ran free abune the brae,
But remember, lass, I'm a ploughman laddie
And the farmer I must obey.

Noo, my love, I must go and leave thee
To climb the hills they are far above,
But I will climb them, the greatest pleasure
Sin' I been i' the airms o' my love.

GLOSSARY,
Burns        small streams
abune        above
brae        hillside        
sin'        since
airms        arms