Why Thinking Makes Us Feel Tired?为什么思考会让我们感到疲惫？

Have you ever wondered why thinking too much makes you tired？ A new studyhas found out some answers to this question. Researchers from the Paris BrainInstitute looked at why mental1 effort makes us tired. They found that when peoplethink a lot， the brain releases a chemical called glutamate2. Too much glutamateupsets the brain’s functions. It means the brain tells the body it is tired and that itmust rest. People who spend more than six hours working on a task that requires alot of thought are more likely to feel tired. A period of rest allows the brain to returnto normal. This explains why a power nap3 is good for us.

你想过为什么过度思考会让你感到疲惫吗？一项新的研究已经发现了这个问题的一些答案。（剩余1304字）