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Tuesdays at Espace des sciences with Isabelle Arnulf, neurologist, sleep pathologies unit, Pitié-Salpêtrière hospital in Paris. "Dreams are the aquarium of the night" (Victor Hugo). What do men and women, the blind, paraplegics, sleepwalkers, students dream about before exams? We learn so much by watching people sleep, by seeing patients mime their dreams, talking, laughing, by studying lucid dreamers and those who have daydreams. This recent scientific and medical research on sleep and dreams helps us understand how our brain works while we sleep.