It's not really a horror story, but I do wonder what happens to the brain under general anaesthesia. Do we actually lose perception as it is ostensibly feels, o

It's not really a horror story, but I do wonder what happens to the brain under general anaesthesia. Do we actually lose perception as it is ostensibly feels, or do we just lose those memories? I had general anaesthesia a few years, and it left me with a vivid memory of watching part of the surgery. Obviously, it isn't a real memory (for a variety of reasons: not possible; wrong surgeon working on the wrong hand; I was "stood" about 30 metres away and the room isn't that large etc.), but it definitely feels different to recalling a "normal" dream, and makes me wonder if the anaesthetic induces hallucinations or lucid-like dreams.