Animals Dream too

Have you ever watched a sleeping dog wag its tail or move its legs while asleep? While it's hard to say for sure whether the animal is truly dreaming, researchers believe that it is likely that animals do indeed dream. Just like humans, animals go through sleep stages that include cycles of REM and NREM sleep. In one study, a gorilla was taught sign language as a means of communication. At one point, the gorilla signed "sleep pictures," possibly indicating the experience of dreaming.