Put rolled oats into a container and add milk. Close the container and shake well. Refrigerate over night.
In the morning, pour your oatmeal out of the container and into a bowl. If needed, add more milk or other liquid.
Place your berries in a pan and sprinkle with sugar. Heat up to medium and stir constantly until the berries start to liquify (just a couple of minutes). You can help the process by mashing them lightly. If you use frozne berries, it is going to take a bit more for the berries to thaw.
Pour your berry mixture over the oatmeal and top with chopped dark chocolate.