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Hmm, someone above actually seemed to hit the nail on the head yet again - and after marinating in some of the new information today I have to admit that there actually has been sensations included with this in the past. Paralysis isn't one of them though, I've heard about this in regards to night-terrors/abduction cases.
But, I oddly remember now that if I focus on this vibratory "sound", it does indeed intensify. But not in pace, or in the vibration - but the way my body feels. I think I can only relate this as a closing-relaxation feeling, but more of a transe. Like a really deep thought, that causes me to lose connection with my surroundings. It sounds to me like an interesting meditative mechanism that begins when "it is time to go to bed".