4. Your Brain Uses 25 Percent of Your Body’s Oxygen and Energy
Even though the average brain accounts for only about 2 percent of body mass, it ties up a full one-quarter of your energy and oxygen intake. That’s because your brain is functioning on rapid-fire all the time, even when you’re sleeping. In fact, studies have shown that your brain experiences more activity when you’re asleep than it does when you’re awake.
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