It's been said that every 33' is equivalent to downing a shot of hard liquor. Are you just really used to downing hard liquor? Kidding! Everybody's reaction to narcosis is different, but it does happen to everyone. You are smart to only go to those depths when you have a good reason, instead of just so you can say you did it.
Training could be a valid reason. Which agency were you taking your Advanced cert with?