Afraid of falling asleep over his books, Sun Jing tied his hair to a roof beam with a rope.
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He is the 悬梁 "hanging from the beam" half of the idiom 悬梁刺股 for studying hard; the 刺股 "jabbing the thigh" half is 苏秦. He kept his door shut to read from morning to night, which earned him the nickname "Mr Closed Door".
