The vibrations
When you chant the three syllables of Aum, you will experience vibration in your body at three spots named below.
When you chant AA: You will experience the vibration around your navel and abdominal area. It is related to the waking state.
When you chant UU: You will experience the vibration in and around your chest cavity. It is related to the dream state.
When you chant EEMM: You will experience the vibration in and around your throat. It is related to the state of deep sleep.
After you chant one Aum, there’s a pause. It represents Turiya, or infinite consciousness.