International team seeks hidden signs of brain damage in REM behavior disorder
People with rapid eye movement (REM) sleep behavior disorder act out their dreams. While sleeping safely in bed, for example, they might throw up their arms to catch an imaginary ball, or try to run from an illusory assailant. Such actions are more than just a nuisance. People with the disorder have a 50 to 80 per cent chance of developing a serious neurodegenerative disease within a decade of diagnosis.