I really like that line & the image it comes with. There's a great deal of urgency in this & with the rhyme it really sets the pace, like heavy breathing, it's plea of sorts. & I like how you described the place. I can imagine where this is taking place, & it appeals to me muchly.
The actual intent of the piece isn't very direct, & I like that too. It allows us readers to take it where we want to, & come to our own conclusions. Vampiric, or otherwise. :)
The punctuation is a bit dodgy, so I would suggest taking another look at that. "somnolence" is also seemed to be too big of a word for the poem & line there, halted the rhythm for me.