It depends on which vibrations you mean. When I do NEW I sometimes feel vibes on the surface of my skin (actually my hubby does), but the vibes associated with separation are probably nonphysical. The reason I think so is that I have sometimes felt/heard/even seen, believe it or not, after I had separated, kind of hovering on top of my physical body, leading me to believe the exit symptoms are entirely energetic/etheric/astral or whatever you want to call it.