Why we dream has been the source of speculation for centuries. Although we’re not sure, many scientists now think dreams help us process emotions and events that happen during our waking hours. “The entire brain is active during dreams—the visual cortex, which creates images, and the limbic system, which deals with emotions, are especially active during dreams,” Dr. Shane says. Brain activity during dreaming increases to the same level as when we are awake, he says, and can be stimulated by what you experienced during the day. “Dreams then make associations with other experiences you have had, helping you integrate what you learned during the day,” Dr. Shane says. “Dreams can help you solve problems and increase your ability to cope with struggles and stress.” In addition, the freedom of control in dreams allows them to be more creative than waking thoughts. Learn why dreaming could ward off dementia.