In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Sweat
To dream that you are sweating means that you will escape the sorrows and sufferings you carry around with you. If you see someone else sweating this means someone is trying to win you over.