十万个为什么·科学启蒙30篇（3）
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Why Do People Dream?
人为什么会做梦
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Dreams occur mainly during REM sleep, a stage when brain activity resembles wakefulness but the body stays paralyzed.
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Scientists think dreaming helps sort memories, strengthen learning, and process emotions from the day.
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During REM, the brain reactivates neural pathways used while awake, linking new experiences to older knowledge.
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People who learn a skill and then sleep well remember it better than those who stay awake all night.
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Strong emotions—especially fear or stress—often show up in dreams because the amygdala stays highly active then.
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Not everyone recalls dreams, but nearly everyone has them unless brain injury or certain medications interfere.
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Lucid dreaming happens when a person realizes they’re dreaming and can sometimes guide the story consciously.
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Nightmares may help prepare us for real threats by safely rehearsing danger responses in the sleeping brain.
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Dream content changes with age: children dream more about animals and family, while adults dream more about work and social life.
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Though dreams feel vivid and real, they usually last only 5–20 minutes and fade quickly upon waking.