Shadow ($8) takes the idea of a dream journal, and expands on it, making it into a smartphone app. It’s part alarm clock, part dream journal, and part cloud-connected application, letting you record your dreams as you wake up, either by voice or text. But, Shadow has loftier ambitions than being just another dream journal. After you record your dreams, certain keywords and data about your dreams are added anonymously to a database, collecting information from a yet-untapped datasource: