Vampirism, the practice or belief of being a vampire or having the characteristics of one, can also be referred to as vampiric, blood-sucking, or nocturnal behavior. Other synonyms for vampirism include parasitism, leeching or feeding off others, and predation. Similarly, a person who exhibits vampiric behavior can also be referred to as a vampire, bloodsucker, parasite, or predator. Some other related terms include sanguinarianism, which specifically refers to the belief in drinking blood for sustenance, and psychic vampirism, which refers to the draining of energy or emotions from others.