This is because when the temperature rises, people can only send out the heat by perspiration, which may cause dehydration and thus the insufficient blood supplying to the brain.
2
还有饭后大量的血液流向胃，血压下降，大脑供氧及营养明显下降，马上入睡会引起大脑供血不足。
There are lots of blood flow to the stomach after a meal, a drop in blood pressure, brain oxygen and nutrition drops apparently, go to sleep may cause insufficient blood supply to the brain.
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