As a 15-year-old volunteer at a sleep laboratory in a Brooklyn, N.Y., hospital, Richard Davidson watched a room of sleeping participants, heads pasted with electrodes, experience dreams or nightmares that registered as brain waves on a gigantic machine. His time in the sleep lab, Davidson writes in his new book, taught him ?virtually every dream contained significant emotion ? terror or joy, anger, sadness, jealousy, or hatred.?
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