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. Dreams don't actually mean anything. Instead they're merely electrical brain impulses that pull random thoughts and imagery from our memories. This is why Freud studied dreams to understand the unconscious mind. Therefore, according to Freud, your dreams reveal your repressed wishes to you.