What happens in your brain while you sleep?

Our brains are complex and elaborate. They contain billions of neurons, don’t fully form until we reach age 25 (opens in new tab)and can generate around 25 watts of power (opens in new tab) — enough to illuminate a light bulb.

Scientists are constantly learning new information about how the brain functions, but what do we know about how this incredible organ operates during sleep? Is it a total mystery, or are there some things we know for sure?

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