Nope, it is not entirely true. Sunken eyes are described as dark circles under the eyes. The long-believed theory that a lack of sleep is one of the most common causes of sunken eyes, however, exhaustion does not directly cause sunken eyes, but it could exaggerate their appearance. It could cast shadows over the fact that five the appearance of dark circles. And there are other factors can accelerate the appearance include allergies, illness, smoking or alcohol consumption. By the way, the most common causes of dark circles under the eyes are genetics and excess pigmentation.