Like everyone said, if you're in a tent, you shouldn't really worry.
I wouldn't camp in the open knowing there were venomous snakes in the region. Humans are a great heat source, and if you toss and turn in your sleep, you may wake up to a nasty, fangy surprise. Hammocks (provided the snakes of the area aren't the climby types) and tents are a sure bet if you know you'll encounter venomous beasties.