Sleeping birds are not only dreaming, but probably dreaming about the songs they sing during the day, researchers said on Thursday. They said their findings add to evidence that dreaming helps animals -- including humans--"rehearse" things they have learned to do in the day, and help them perform better the next day.
Biologist Daniel Margoliash and colleagues at the University of Chicago were studying zebra finches.
They noticed that when the birds were asleep, their brains showed a burst of activity in an area known as the robustus archistratalis (RA), which is known to be involved in singing