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In the world of music, practice makes perfect, And the same is true of zebra finches who sing while they sleep, new research has found. Experts have known for almost 20 years that brain patterns that control singing in the birds are present while they dream. A previous study found that sleeping zebra finches listen to the songs of other birds while they are awake and mimic their tunes silently in their brains as they slumber. Now, for the first time, researchers have discovered that the creatures actually move their vocal muscles in response to this process. Experts have known for almost 20 years that brain patterns that control singing in Zebra Finches are present while they dream.