There are many different theories about why people dream and what their dreams mean. Every person has different dreams. Some psychologists believe that dreams reflect what is happening in the unconscious mind (the part of the mind that works by itself). Others think that people, places, and objects in dreams are symbols for other things in the dreamer's real life. Throughout history people have tried to make sense of dreams to learn things from them, and have often used them for divination or fortune-telling. Today there are still many books and websites devoted to making sense of dreams.