in my case, i'm lucky that most of my glimpses of the dissolution process fall within the pleasant category. i experience the vibrations like champagne bubbles, or sometimes like big waves, as if my body is like a seaweed being blown by underwater current.
however, there were times when i feel a sense of dread (e.g. fear of death) as i experience the vibrations and waves. also, i remember just a couple of nights ago, while i was in between sleeping and waking, i felt that there were creatures (like demons) gnawing my forehead and the back of my neck. that scared the shit out of me. but a part of me knew that it was a dream (or a lucid dream, or in between state) so i just ignored them, let them at it, and i just plunged back and dissolved into deep dreamless sleep

~C