I have looked into survival instinct. That's becoming less of an issue now for me since I'm completely trapped (cf. David Foster Wallace's 'burning building analogy', and how jumping is the lesser of two evils). But I'm still someone who's, at heart, highly neurotic and I suppose the process of watching myself die terrifies me. Some people have described SN as relatively 'peaceful', i.e. they just became tired/unconscious, but it seems to vary. So I'm curious how people felt, I suppose .. like did they panic, vomit, fall unconscious etc.?