In the Eastern Han Dynasty, a man named Sun Jing was a famous politician.
As a young man, he was diligent in study and often forgot eating and sleeping. When he was reading, he tied his hair to the roof beam with a rope. Therefore, when he dozed, he would feel pain and wake up as his hair was pulled upward by the rope, so that he would go on studying.
Su Qin in the Warring States Period was another example like Sun Jing. He felt sleepy when he was reading, so he took an awl and stabbed it into his own legs. Thus, the sudden pain would wake him up, and he could continue reading.
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