Noticing, being mindful of the overall sensation/vibration of the body requires an attentiveness to the moment. Mindfulness of the moment creates a stoppage (even if only for a split second) of the “normal” current of the mind that flows subconsciously or unconsciously in its familiar, habitual patterns of thinking/feeling/sensing.
This “split second” of “no-thought” can be enough to create an opening for the body/mind/psyche to experience the underlying vibration, or “Hum of consciousness.” This need not be a “big wow!” kind of experience, but rather a simple awareness that comes with an acknowledgment of vibrations and sensations that are just underneath what you might normally pay attention to.
At this stage of noticing, it is helpful to understand that there are no insignificant sensations, as any vibration felt can be used as an entry point to the “next” underlying vibration.
At a certain point of noticing and following sensations, there can be a sense of falling into a swoon (an ecstatic trance), as the body/mind seems to hold and be held by the subtle vibration it has connected with. This process is like listening to music so beautiful that it “hurts,” or like being ecstatically absorbed and surrendered in dance!