When did your baby drop?

At what week of pregnancy did your baby drop down? Did it happen overnight, or without your knowledge? Or was it a distinct moment?
Up until today, I've felt no pressure down south, but tonight I've had some pretty crazy Braxton hicks pretty much all night, and now I'm feeling some crazy movement lower than I've felt him before! I'm 35 weeks tomorrow... Wondering if tonight's activity was an official dropping down into the birth canal, or just a super active crazy baby.