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?
Well, for one, we know it's important. "Every animal on this planet that we have observed carefully has been shown to sleep — even fruit flies, roundworms, and jellyfish," Dr. David Raizen, an associate professor of neurology at the University of Pennsylvania, told Live Science in an email. "Hence, sleep must be serving a very important function, which has led to its persistence throughout evolution.
"This is especially noteworthy because sleep incurs costs," Raizen added. "Animals are vulnerable to predation during sleep and they are not productive — they do not forage for food, and they don't reproduce."
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