Not necessarily. A vegetative state was a medical term that referred to a coma caused by a serious injury or disease that damaged the brain function. If a vegetable slept in a quiet environment for a hundred years, his body might gradually adapt to the environment during the sleep, but it might not necessarily change. Immortality referred to the ability of an organism to continue existing without being eliminated. Although vegetative people did not experience any physical changes during their slumber, they might be able to live longer spiritually. For example, they might experience the passage of time and continue to interact with the world around them. However, immortality is impossible in biology because all living things will die at some point.