Comment by autoexec

You might try https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8054915/ which states: "General anesthesia is characterized by loss of consciousness, amnesia, analgesia, and immobility." and further down shows brain activity recorded while under anesthesia via EEG. The paper looks at the differences and similarities of brain activity while under anesthesia and sleep. This is only possible because, however changed or slowed by it, the brain is still active while under anesthesia