A workday filled with a string of mentally demanding tasks can leave you feeling drained. After long hours of mentally tracking one thought to the next, you’re probably more likely to choose a relaxing evening of streaming TV shows than to tackle a tough task on your to-do list or to make time on a creative pursuit. A new study provides a biological explanation for this familiar phenomenon: thinking hard leads to a buildup of chemicals that may disrupt the functioning of the brain.
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