In Oklahoma in 2009, 5-year-old Ryan Hammons would lie awake at night and plead: "Can I go home? Can I see my mom?" or "What happened to my children?" He was lying beside [his mother] one night, Cyndi Hammons remembers, when he said that he needed to tell her something. "I think I used to be somebody else," he whispered. Ryan was waking up sobbing at night and describing things his mother couldn't fathom: that he remembered living in Hollywood in a big white house with a swimming pool. That he once had three sons and a younger sister. That he drove a green car, and his wife drove a black one. Not long after, Ryan saw a man he recognized in one of his library books, a peripheral figure in a photograph of six men: "That's me!" he told his mother. With the help of a production crew from the A&E series "The Unexplained," they were able to identify the man as Marty Martyn, a movie extra and talent agent who died in 1964. Cyndi and Ryan traveled to California to meet Martyn's daughter, Marisa Martyn Rosenblatt, who was 8 when her father died. She ultimately confirmed many of Ryan's statements about Marty Martyn. She didn't know that her father had driven a green car, or that he had a younger sister, but it turned out both claims were accurate. Marty Martyn's death certificate cited his age as 59, but Ryan insisted he had died at 61; census records and marriage listings ... confirmed this, as did Martyn's daughter. Since the 1960s, more than 2,200 children from across the world have described apparent recollections from a previous life. Sometimes a child presents enough identifying information for relatives or researchers to pinpoint a deceased person, but ... about a third of the cases in the database do not include such a match. The most pronounced and convincing cases ... tend to occur in children between the ages of 2 and 6. They might suddenly describe places they have never been, people they have never met, sometimes using words or phrases that seem beyond their vocabulary. Their descriptions of past-life recollections often fade away entirely by the time the child turns 7 or 8.