Everything - living and non-living - is surrounded by its aura, the envelope of its electro-magnetic radiation. This is normally invisible to naked eyes. The aura of a living being is interaction of material and psychic radiation. In these profound states of relaxation the aura becomes perceptible.
This perception is partly sensory and partly extra-sensory. When the motionless state is perfect, the ingress from external environment is minimal In this state the consciousness transcends the physical body and becomes aware of the activities of the subtle inner body. The awareness of the subtle body affects attitudinal change.