Over low heat, stir sugar, syrup, cinnamon, and butter until melted and blended.
Pour mixture into a 13"x9" pan, spread evenly on bottom.
Place 8 bread slices over mixture, squeezing to fit if necessary.
Place remaining 8 slices on top of first 8.
Beat eggs with milk and vanilla, pour over bread and refrigerate 8 hours or overnight.
Bake in preheated 350 degree oven for 45 minutes.
To serve, cut into 8 servings, then flip over onto plate with a spatula, caramelized side up. Put a dollop of sour cream and strawberries on top.