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From Wikipedia:

Studies have observed dreaming in mammals such as monkeys, dogs, cats, rats, elephants and shrews. There have also been signs of dreaming in birds and reptiles.

Have there been such signs in any invertebrate species?

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closed as off-topic by The Last Word, Chris, biogirl, WYSIWYG, Satwik Pasani May 30 at 4:39

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2  
Do they even sleep? straightdope.com/columns/read/1646/do-insects-sleep –  Oreotrephes Apr 21 at 18:45
4  
Belongs on cognitive science SE –  The Last Word May 29 at 6:17
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