十万个为什么·科学启蒙30篇（1）
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Why Do We Dream?
我们为什么会做梦？
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Dreams mostly happen during REM sleep, a stage when your brain is highly active but your body is temporarily paralyzed.
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During REM, areas involved in emotion, memory, and visual processing light up, while logic and self-awareness centers stay quieter.
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This explains why dreams often feel vivid and emotional, yet lack clear cause-and-effect reasoning or time awareness.
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One theory suggests dreaming helps the brain sort and store memories from the day—strengthening useful ones and fading irrelevant details.
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People deprived of REM sleep often struggle more with learning new tasks or recalling recent events.
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Another idea proposes that dreams act like mental simulations, letting us rehearse responses to threats or social situations safely.
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Nightmares might reflect real anxieties, but frequent ones can also result from fever, medication, or irregular sleep schedules.
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Lucid dreaming—when you know you’re dreaming and sometimes control the story—is possible for some people with practice.
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Blind people who lost sight after age five often dream visually, while those born blind experience dreams dominated by sound, touch, and emotion.
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Though we spend about six years of our lives dreaming, no one fully understands why it evolved—or whether all animals dream.