十万个为什么·科学启蒙30篇（1）

6 / 30

我们为什么会做梦？

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