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Why do we sleep and why do we dream? In this film I answer these questions. And I suggest that it is worth sleeping long. * The episode was created thanks to the support of Viewers: zrzutka.pl/NaukaToLubie If you like my films, subscribe to my channel! http://youtube.com/naukatolubie?sub_c... 00:00 Introduction 0:40 Sigmund Freud and dreams 1:12 Experiments on cats 3:34 Experiments on rats 6:23 Sleep in humans