The reason that people 40+ have puffy eyes is not lack of sleep, it's that the fat pads under your eyes start to bulge. Solution: use an eye cream with caffeine or rosemary, or use cool compresses. Fat - it's the bane of our existence! Who knew that you have fat pads under your eyes?
Here are some more helpful suggestions: http://www.wikihow.com/Cure-Puffy-Eyes