The term 'Sleeping Sickness Vector' refers to the TSETSE fly, which is a six-letter insect found in Africa. The TSETSE fly is a vector for the disease known as African Trypanosomiasis, more commonly known as sleeping sickness. This disease is caused by a parasite that is transmitted to humans and other animals through the bite of an infected TSETSE fly. The TSETSE fly is the only known vector for this disease, and it is responsible for the spread of the disease throughout Africa.