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 - Sheets
If you are a single woman and dream of sheets this means you will marry. If you are already married and dream that you are washing or laying out sheets then someone is gossiping about you.