What is consciousness in essence?

What is consciousness in essence? Why are our actions accompanied by an internal subjectively experienced life, and do not proceed in the "darkness" of unconscious existence? What allows us to exist in the physical universe as more than complex physical systems? Why are we not unconscious zombies who do not have mental experience, but have manifestations of psychic abilities (such as perception, thinking, memory, imagination, etc.) at the behavioral level of being, characteristic of conscious subjects, and can pass due to their structural and functional arrangement any modifications of the Turing test? Analyzing the works of his predecessors, D. Chalmers notes that they mostly solved the “light” problems of consciousness that affect the overall functioning of the psyche: “How does the brain process stimuli coming from the environment? How does he integrate information? How do we generate internal state reports?”