Medical research has shown interest in the state of the unconscious mind, what it can produce, and how it is interpreted. While there is no universally agreed upon definition of dreaming, many medical research teams have pursued the areas of dreams and dream analysis. Thought by medical groups to be illusions during a deep state of sleep, a dream is the most common brain activity found during sleep. Sleeping is an essential part of every human being because it plays a significant role in the development of brain. Most dreams are said to occur during Rapid Eye Movement, or REM. From medical research, we know that dreams can occur in any age group. Some believe, in any species, as well. Now that medical research has offered opinions on what dreams are, there is still the questions of why. A medical group or certain schools of thought have all offered their theories on why we dream. A common theory from Freudian theorists believes that dreams are simply subconscious wants and desires. To rid yourself of any reoccurring dream, you must pursue the dream in the waking world. Continue exploring Daily Medical Assistant .com to learn more about the science of dreams.