Boil the water.
Measure out 1/4 cup oatmeal (remember that it doubles while cooking) and place in thermos.
Put 1/2 cup boiling water into thermos. (Add a bit more water if you like a mushier oatmeal.)
Put the lid on and give it a gentle swirl.
Wake up and open the thermos to find hearty, cooked oatmeal inside. Serve with your fav toppings.