I was surprised after my recent foot op (neuroma removal, under propofol sedation rather than GA) just how many days I remained stupid-headed for. Definitely the anaesthetic drugs, not the Xanax. Don't plan to be clever for three or four days.

I was at the other end of the spectrum from you though with the waiting - I slept solidly whilst waiting to go in, and woke up only briefly to hop over onto the table and say hi, then go back to sleep. No premed, just shift work in the lead up.