Combine brown sugar, butter, and corn syrup in a small saucepan.  Bring to a boil over medium heat, stirring constantly.  Pour mixture into a 9 x 13 glass baking dish, rotate pan to coat the entire bottom with the caramel sauce.  Whisk together the milk, eggs, vanilla and salt in a medium bowl.  Arrange six of the bread slices in the prepared pan, cover with 1/2 of the egg mixture.  Repeat with the remaining slices of bread and remaining egg mixture.  Cover and refrigerate overnight.  In the morning, preheat oven to 350 degrees.  Bake the strata uncovered for 40 - 45 minutes or until puffed and golden brown.  Let stand for five minutes.  Cut into portions and invert onto plates, serve warm.

Can't find ciabatta bread?  You can definitely substitute any bread of your choice.  A hearty bakery style bread works the best.