A diagnosis for REM sleep behavior disorder is based on the following criteria: - Repeated times of arousal during sleep involving talking, making noises, or performing complex motor behaviors, such as running movements, that often relate to what is happening in the dream - Recalling dreams associated with these movements/sounds - If awakening during when the episode is occuring, the individual is alert and not confused or disoriented - Polysomnography (sleep study) shows increased muscle activity during REM sleep - Sleep disturbance is not caused by external stimuli, medication, a mental health disorder, or substance abuse