Why don’t vampires sleep?

Once you become a member of the Vampire Clan, you gain "immortality", or become a "living dead". Vampires are creatures that are different from humans, and their body tissues have undergone complete changes. The vampire's teeth can be extended at will, although most of the time they are hidden to conceal their identity. When vampires suck blood, they will use their own methods to heal the wounds to cover up the traces. The vampire's heart stops beating, but they can also control the beating of their own heart. The blood in the body flows in a diffusion manner. Because the capillaries are no longer full of blood, the skin of the vampire is particularly pale. Sometimes, even tears of blood are shed while crying. Vampires can use the blood in their bodies to heal themselves. When they are injured, the blood in their bodies will concentrate on the injured area, and the area around the wound will glow purple-red, and they will heal quickly. Vampires don’t need to eat, but they need to constantly absorb blood. When vampires feel hungry, they will have a strong desire for blood. This desire is as strong as human hunger. So no need to sleep