Generally speaking, you are easy to get the puffy eyes if you drink too much water before you go to bed. But it is not the only reason. In fact, the appearance of puffy eyes is related to the disorder of his body's working condition, especially for the problem of kidney. Or other reason that causes the water metabolism unbalancing and leads to the accumulation of water in body, which in last produces the symptom of puffy eyes. Besides, too much sleep will not cause the puffy eyes. But if you have not enough sleep, the puffy eyes may find your door of house in turn.