Overnight Oatmeal with Blueberry Sauce

1. Place the rolled oats, peanut butter, maple syrup, and milk in the pitcher.
2. Refrigerate the pitcher for at least 6 hours, but preferably overnight.
3. Place the blueberries, lemon juice, and sugar in a saucepan. Cook over low heat until the blueberries break down.
4. Pour the blueberries into the blender jar and blend on speed 7. Strain the sauce through a fine-mesh sieve.
5. Pour the blueberry sauce over the rolled oats before serving.