Charon's Mis-metered Limerick

Charon’s Mis-metered Limerick
upon reflecting on the peculiar state of mind created by 2 1/2 hours of sleep

My silence of mind is lost, now,
dropped into pools of phonographs turning,
scratched by the nails of the hands that I held,
struck by the fangs of a dying viper,
screaming like a jackrabbit cornered at nightfall,
howling into noon-time suns with unsharpened, unthrusted knives,
getting roped, dragged off by a dusty Brain locked away,
held mesmerized by a deluge of hymns

which crack burning whips,
sing folded lies,
and trick you into drifting away,
your body pressed against cold Charon’s
while your eyes and pores sweat blood.

I was loving it up until this:

"howling into noon-time suns with unsharpened, unthrusted knives,
getting roped, dragged off by a dusty Brain locked away, "

I loved the imagery, but you seemed to start rambling, and it seemed rushed. But I do like the way you started the second stanza. The poem read much better after the other two long lines. Overall, it sounds better reading it the second time...but not everyone reads poems to twice. However, for those that do (like myself), it's phenomenal.

howling into noon-time suns with unsharpened, unthrusted knives,
getting roped, dragged off by a dusty Brain locked away,

there are too many syllables in these lines
and it does appear you are rambling.
shouldn't you lowercase "brain"?

I really enjoyed this poem. You have a beautiful vocabulary and some great imagery, but I have just a few nitpicks to point out...

screaming like a jackrabbit cornered at nightfall,
howling into noon-time suns with unsharpened, unthrusted knives,
getting roped, dragged off by a dusty Brain locked away

Okay, first of all, the first line in this section was just chilling - vivid, powerful simile.
Alright, I know Chevy and xanthan have already talked about this line, but there were a few other things here that bugged me. Firstly, I wasn't fond of the adjectice 'unthrusted', unsharpened seems to imply that. And secondly, I didn't like 'getting roped'. I think 'being' would be a better helping very here if you need a helping verb at all. Just 'roped' would work as well.
Besides that, I loved this. Excellent job!