The Shakti in the body does all the work while remaining hidden. It digests food, makes the heart beat, and does countless other small and big functions of the body. She can’t be sleeping. If she had slept, how could she have done so much work? Perhaps we call it sleeping because even when a man’s body is in deep sleep, it continues to do innumerable tasks of life, otherwise would he not have died? It doesn’t do just one thing, just generate conscious thoughts. Similarly, sleeping Shakti means that all the functions of the body are being carried out by it, but awakened thoughts are not being generated. This can be called a semi-dormant state because ordinary or vague thoughts are still arising. Light thoughts come to a person even during sleep in the form of dreams. To awaken Shakti means to bring it into its most expressed form and that is Kundalini awakening. Just as there can be countless levels of awakening of a man, but the real awakening is the one in which he is most expressed, which is Kundalini awakening. Other states can also be called sleep. It is mentioned many times in the scriptures that this world is like a dream. The ordinary life we are living is just a dream, meaning we are asleep. Real awakening is the state of Kundalini awakening. Below Sahasrara, there are all the pits, Mooladhar is the biggest pit. Because a little amount of energy leaks from other pits to Sahasrara, there is no complete darkness there. But when Kundalini is present in Mooladhara, it is most dark, because it is the farthest from Sahasrara. This movement of energy is of special importance in human being, because he walks while standing, and special strength is required to deliver blood high up to the brain. When there is a contraction of the muscles due to Shakti reaching the chakra through yoga or physical activity, then the consumption of nutrients increases there, which automatically increases the blood circulation there. That is why it is said that Shakti controls blood circulation. However, it appears directly controlling the speed of contraction and relaxation of muscles, thereby controlling blood circulation indirectly. This does not often appears happening in animals because their backs are straight. Because monkeys, langurs, chimpanzees etc. also become quite upright, that is why they are also playful so that the Shakti keeps flowing and the blood circulation continues smoothly in the whole body.
According to physiology, not only nerve fibers control the body, but biochemicals called hormones also control them and the organs also have their own local control. But the nerves keep the entire body functioning smoothly. It has never been heard that in such and such a yogi, some organs were cured by Nadi Chalana, but there was no effect on other organs, especially the organs controlled by hormones. From this it also seems that nerve fibers are not called nadis. It is said that electrical energy flows in the nerve fibers and life energy or Shakti flows in the nadis. However, when there is movement in the chakras, the hormone producing cells will also become active and the local systems will also become active.
There are many similarities between Shakti and energy, but both are different. Energy is inanimate, whereas Shakti is conscious due to the presence of Shiva with it. Energy can be present in any inanimate thing or machine etc., but Shakti can be present only in a conscious being. The sex-based energy rising from the perineum through Kundalini Yoga is called Shakti because it feels like bliss of samadhi. In simple words, this strengthens the Samadhi picture or Kundalini picture. And in simple words it leads towards God. Because it provides energy to the brain, the energy suppressed in the subconscious mind gets destroyed by coming out or getting expressed. Although this also happens through physical activity, Shakti there also travels through the same path. Meaning that due to physical movement, Shakti keeps gathering on the perineum and keeps rising up through the back. That is why Kundalini Yoga is very beneficial for physically hard working people also.
Demystifying Kundalini 