同床共寝 sleep in the same bed
Explanation
指两个人睡在一张床上，多用于夫妻或关系亲密的人。
Refers to two people sleeping in one bed, mostly used for couples or people with close relationships.
Origin Story
很久以前，在一个偏僻的小山村里，住着一对年轻的夫妻。丈夫名叫李大宝，妻子名叫王秀英。他们结婚三年，感情一直很好，每天晚上都同床共寝，你侬我侬，恩爱甜蜜。有一天晚上，李大宝突然做了一个奇怪的梦，梦到他和妻子睡在一张床上，但却感觉不到妻子的体温，而且妻子脸色苍白，如同死人一般。李大宝惊醒后，出了一身冷汗，他觉得这个梦预示着什么不好的事情。他忐忑不安地度过了一夜，第二天一早，他便出门到附近的镇子上找算命先生。算命先生掐指一算，脸色凝重地说：“你妻子近日将有灾难，必须小心谨慎。”李大宝听了这话，心急如焚，立刻赶回家中。他见到妻子后，发现妻子确实脸色憔悴，精神不振。李大宝连忙将算命先生的话告诉了妻子，妻子听了也吓了一跳。夫妻二人开始更加珍惜彼此，相互扶持，共同度过了难关。从此以后，他们更加恩爱，同床共寝的每一天都充满了幸福和快乐。
Long ago, in a remote mountain village, there lived a young couple. The husband's name was Li Dabao, and the wife's name was Wang Xiuying. They had been married for three years, and their relationship had always been good. Every night they slept together in the same bed, affectionately and lovingly. One night, Li Dabao suddenly had a strange dream. He dreamed that he and his wife were sleeping in the same bed, but he couldn't feel his wife's body temperature, and his wife's face was pale, like a dead person. Li Dabao woke up in a cold sweat. He felt that this dream foreshadowed something bad. He spent a night full of anxiety and unease, and the next morning he went to the nearby town to find a fortune teller. The fortune teller, after a short calculation, said with a serious expression: "Your wife will soon have a disaster, you must be careful." Li Dabao was very worried and immediately rushed home. When he saw his wife, he found that her face was haggard and her spirit was weak. Li Dabao immediately told his wife what the fortune teller had said, and his wife was also shocked. The couple began to cherish each other more and support each other, and together they overcame the crisis. From then on, they loved each other even more, and every day they slept together in the same bed was filled with happiness and joy.
Usage
形容两人关系密切，多用于夫妻之间。
Describes a close relationship between two people, mostly used for couples.
Examples
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夫妻同床共寝多年，感情深厚。
fū qī tóng chuáng gòng qǐn duō nián, gǎnqíng shēn hòu
The couple have slept together for many years and have deep feelings for each other.
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他们虽然同床共寝，但并没有什么感情。
tāmen suīrán tóng chuáng gòng qǐn, dàn bìng méiyǒu shénme gǎnqíng
Although they slept in the same bed, they didn't have any feelings for each other..