Yeah, if we have the black eyes, I think we will be less beautiful than without the black eyes. As a matter of the fact, many people are trying to find ways to reduce the black eyes; as to the question "does lack of sleep can cause the black eyes?" I just want to tell you that do not blame the sleep, because lacking of sleep will not cause the dark eyes, which are like your eyes are hit while you are sleeping. Until now, there is not enough evidence to explain why you will have the black eyes, but according to some elder people, they said that is because someone we do not known as the ghost hit us. Pls relax yourself. When you wake up the next day, you just need to apply the ripe egg on the black eyes slightly. After some time, the black eyes will disappear.