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I have watched my dog sleeping and it appears to me that he goes through different states of sleep; and at some point during it he has rapid eye movement and starts to yap like he is a little puppy and sometimes he wags his tail. Is he dreaming?Also I am interested in whether other primates dream. I know that monkeys, gorillas etc can learn to use sign language quite proficiently and that their intellect is developed in line with a human five year old. Has anyone asked them this question, or is the concept too abstract for them?
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