Did you know that sleeping on a flat pillow can create puffiness around your eyes? When you are sleeping, if your head isn't slightly elevated, fluids can gather under your eyes, creating a puffy look. Also- if you have dark circles, it could be that you are low in iron. Dried mango's, lentils and beans are full of iron. If your doctors suggests an iron supplement, taking it with vitamin C (such as a glass of OJ) can help with the absorption.