"We now know all consciousness is powered by electricity, including dreaming, and it turns out the dreaming brain is as active as the waking brain – sometimes even more so," he said. "In this theory, dreams are like a virtual simulation where we can test different responses and imagine the consequences," he said. Brain functionalityA straightforward theory about why we dream is that dreaming can be good for "keeping the brain tuned and ready even during sleep." In other words, the processes that the brain experiences as you're dreaming may be helpful for brain functionality and keeping your brain sharp. But adrenaline is still present while you're sleeping; think about how your heart can race when you're dreaming about being chased.

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Persons: Jandial, Dr, Rahul Jandial, Michael Myers, Isabelle Arnulf, Rosalind Cartwright, —, Cartwright, Adrenaline's Organizations: Gallup, CNBC