Why is it my stomach always make a growling noise after I eat or lay down? Even though I am not hungry.

Borborygmi. This is the fancy technical term for stomach grumbling noises! generally benign but can indicate incomplete digestion of foods containing carbohydrate, including milk and other dairy products (lactose intolerance or the use of ?-glucosidase inhibitors by diabetics), gluten (protein in wheat, barley, and rye) (celiac disease), fruit, vegetables, beans, legumes, and high-fiber whole grains.
Digestion. You are hearing your digestive system at work. Your stomach and intestines are continuously contracting and relaxing to move your food (and gas) through the process. The noise you're hearing is that movement.