Thanks snoops - that clears things for me. I was just confused when the title of post said spinal tap - but I think it must've been an epidural so I was looking into effects of anesthesia.

Where the heck did you come across that last rubric? And why didn't I find it?

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Man, do not pride yourself on your superiority to animals. For they are without sin and you in your greatness defile the earth by your appearance on it and leave traces of you foulness after you. Dostoyevsky