Does quantum stuff happen in the brain? Who knows. But I love the strategy of "welp, if anesthesia turns off consciousness" maybe we can work backwards to figure out how it does work! Penrose is a famous mathematician and scientist of spacetime and early universe theoretical work. He also created a theory for consciousness and how it emerges in the brain's microtubules, called Orchestrated Objective Reduction. It's been criticized for years, yet we still find stuff that it may be true.