Kundalini is a psycho-spiritual energy, the energy of the consciousness, which is thought to reside within the sleeping body, and is aroused either through spiritual discipline or spontaneously to bring new states of consciousness, including mystical illumination. The power of kundalini is said to be enormous. Those having experienced it claim it to be indescribable. The phenomena associated with it varies from bizarre physical sensations and movements, pain, clairaudience, visions, brilliant lights, superlucidity, psychical powers, ecstasy, bliss, and transcendence of self.