I think Fred said in his book that energy sensations are related to reduction of sensory input. RB mentions loud sounds feeling like blows to the solar plexus in deep trance, so it's not a stretch to say that other usually ignored perceptions, such as blood flow through the veins, would manifest as vibrations.
I personally thought the chapter on the transition process was excellent, a big step forwards to understanding the nuts and bolts behind the OBE experience.
EDIT: Oh wait Ashes, you are Fred. Thanks for the excellent book, by the way.
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