i did not have a general for my own surgery, just a spinal, so in my experience it is not the anaesthetic. i reasearched this a bit after my mum's last surgery

i did not have a general for my own surgery, just a spinal, so in my experience it is not the anaesthetic. i reasearched this a bit after my mum's last surgery (can't find links now) and it seems there is a theory that fats released into the bloodstream by surgical procedures can be causing the hallucinations. obviously, this is not an area open to easy research by clinicians.