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Why Does Thinking Hard Make You Tired?

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 Biology   |   Health   |   Science
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After studying or taking a test, do you ever get tired? Why do we get sleepy after thinking hard?

Watch More: http://dne.ws/1P6UOBY

Read More:
The body and the brain: Impact of mental, physical exertion on fatigue development
http://www.sciencedaily.com/releases/2015/07/150730162454.htm
“Do you ever notice how stress and mental frustration can affect your physical abilities?”

Effects of Mental Fatigue on the Development of Physical Fatigue
http://hfs.sagepub.com/content/56/4/645
“The findings suggest that interference in the prefrontal cortex may influence motor output during tasks that require both physical and cognitive processing.”

Why Does the Brain Need So Much Power?
http://www.scientificamerican.com/article/why-does-the-brain-need-s/
“It is well established that the brain uses more energy than any other human organ, accounting for up to 20 percent of the body's total haul.”
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