我们为什么会做梦？沉睡大脑的谜题
Every night, as we fall asleep, our brains begin to create strange and vivid stories. We might fly over cities, talk to people we have never met, or relive an old memory. For thousands of years, humans have wondered what dreams really mean.
每天夜里，当我们入睡时，大脑便开始编织离奇而生动的故事。我们也许会飞越城市，与素未谋面的人交谈，或重温一段旧日的记忆。几千年来，人类一直在思索：梦究竟意味着什么。
Modern scientists cannot fully explain dreams, but they have found some important clues. Most vivid dreaming happens during a stage of sleep called REM, when the eyes move quickly and the brain is almost as active as when we are awake.
现代科学家还无法完全解释梦，但已经找到一些重要线索。大多数生动的梦发生在一个叫「快速眼动」（REM）的睡眠阶段——此时眼球快速转动，大脑几乎和清醒时一样活跃。
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