This is a Nova Scotian version of "The Drowsy Sleeper", which was collected by W. Roy Mckenzie in his Ballads and Sea Songs from Nova Scotia (1928; reprinted Folklore Associates, 1963, pp. 99-100; music is on p. 396).

WHO IS AT MY BEDROOM WINDOW
(From the singing of Miss Greta Brown, River John, Pitou County.)

1 "O who is at my bedroom window,
Disturbing me from my night's rest?"
"It is, it is your own true lover,
The very one that you love best.

2 "Go, Maggie dear, go ask your father,
See if our wedding bride may be.
If he says 'No,' love, come and tell me,
And I'll no longer troubled be."

3 "It is no use of asking father,
For he is on his bed of rest,
And by his side a silver dagger
To stab the one that he loves best."

4 "Go, Maggie dear, go ask your mother,
See if our wedding bride may be.
If she says 'No,' love, come and tell me,
And I'll no longer troubled be."

5 "It is no use of asking mother,
Foe she is on to set us free.
You'd better go and court some other,
For you cannot marry me."

6 "I can climb the highest mountains,
I can rob the eagle's nest,
I can go and court some other,
But you're the one that I love best."

7 She drew the dagger from her pocket
And buried it deep, deep in her breast,
Sang adieu to her cruel parents:
"I'll die with the one that I love best."

8 He drew the dagger from her bosom
And buried it deep, deep in his breast,
Sang adieu to her cruel parents,
And she died with the one that she loved best.

There's another Canadian variant which was linked to by Dicho in the former thread.