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If you've ever watched an animal sleep and wondered what they're dreaming about, science has the answers.

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Sources:
https://www.researchgate.net/profile/...
https://cogsci.msu.edu/DSS/2009-2010/...
https://journals.plos.org/plosone/art...
https://www.cell.com/iscience/fulltex...
https://www.sciencedirect.com/science...
https://www.sciencedirect.com/science...
https://www.sciencedirect.com/science...

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https://commons.wikimedia.org/wiki/Fi...
https://www.frontiersin.org/articles/...