The Nosferatu (caleta)

Presently my soul grew stronger; hesitating then no longer,
"Sir," said I, "or Vampire, truly your forgiveness I implore;
But the fact is I was napping, and so gently you came rapping,
And so faintly you came tapping, thirsty to my chamber door,
That I scarce was sure I heard you", here I opened wide the door;
Light was there, and nothing more.