When the animals are shown a food treat at the end of a path they cannot access and then take a nap, the neurons representing that route in their brains fire as they sleep – as if they are dreaming about running down the corridor to grab the grub.
"It's like looking at a holiday brochure for Greece the day before you go – that night you might dream about the pictures," says Hugo Spiers of University College London.
http://www.ucl.ac.uk/news/news-articles/0615/260615-rats-dream-paths-future/
http://www.newscientist.com/article/dn27788-rats-dream-about-the-places-they-wish-to-go.html
Interesting studies, I've always been fascinated about living being's perceptions of time.
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