https://www.mcgill.ca/oss/article/health-general-science/knocked-out-put-under-anesthetized-and-sedated-different-types-anesthesia
scientificamerican.com/article/general-anesthesia-coma/
https://www.livescience.com/3021-anesthesia-knocks.html
https://www.sciencedaily.com/releases/2018/01/180109153446.htm
https://mosaicscience.com/story/anaesthesia-anesthesia-awake-awareness-surgery-operation-or-paralysed/
https://www.americanboardcosmeticsurgery.org/what-is-it-really-like-to-undergo-general-anesthesia