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In 960 AD, Zhao Kuangyin established the Song Dynasty. He adopted a strategy of defeating rivals one by one, successively conquering states like Jingnan, Hunan, and Later Shu.
In 974, he summoned Li Yu, the last ruler of Southern Tang, to the capital Bianjing for an audience.
Fearing he would be detained, Li Yu sent Xu Xuan to Bianjing to seek peace.
Emperor Taizu of Song directly stated, "How can one tolerate others snoring soundly beside one's bed?"

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Open the tool →卧榻之侧,岂容酣睡 (wò tà zhī cè , qǐ róng hān shuì) is a Chinese idiom (chengyu) meaning “one cannot tolerate a potential threat or rival within one's sphere of influence or territory; one cannot allow others to encroach upon one's domain”.
卧榻之侧,岂容酣睡 is pronounced wò tà zhī cè , qǐ róng hān shuì in Mandarin Chinese.
Literally, 卧榻之侧,岂容酣睡 means “How can one tolerate others snoring soundly beside one's bed?”. It is used to mean “one cannot tolerate a potential threat or rival within one's sphere of influence or territory; one cannot allow others to encroach upon one's domain”.
卧榻之侧,岂容酣睡 comes from a classical Chinese story dating back to the modern era. The full story is on this page.
自己的床铺边,怎么能让别人呼呼睡大觉?比喻自己的势力范围或利益不容许别人侵占