A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. The content and purpose of dreams are not fully understood, although they have been a topic of scientific, philosophical and religious interest throughout recorded history. Dream interpretation is the attempt at drawing meaning from dreams and searching for an underlying message. The scientific study of dreams is called oneirology.
While you sleep with your eyes closed, your ears deaf, your tongue mute, and your arms and legs motionless, how do you travel, meet people, and do many things in a few minutes or even seconds? When you get up in the morning, you feel deeply influenced by that few seconds of adventure. Although Freud and his followers attribute dreams to the subconscious self, to thoughts and desires, impulses and past experiences, how can you explain dreams that inform you of a future event with which you have no contact or have never thought about? How do we dream? With what part of our body or being do we dream? Why do dreams last only a few seconds? How (and why) do we remember what we dreamed? All of these and many similar questions are like puzzles awaiting to be solved by science.