Scientists control the content of dreams. However, the significance of the findings reported in this article are not really along the lines of “lucid dreaming” or anything like that. The exciting thing was the demonstration that patients with damage to the brain region called the hippocampus, who as a result have no short-term memory, nevertheless dreamed of their day’s experience. Arguably, this is one of the most direct confirmations of the role of the unconscious in shaping the content of dreams, which has recently come under fire.