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How Your Brain Conjures Dreams

You dream for two hours every night, but for something so common, it’s a remarkably enigmatic process. Only in the past few decades, with the advance of technology like fMRIs that lets us record and visualize activity in the brain, have neuroscientists begun to figure out how and why we experience these reveries. While sleepy interludes seem to rely on many of the same mental processes we use while awake, researchers are still trying to understand the way they work together during slumber. Here’s how we think our brains drive our nocturnal hallucinations.

A. Remember

Dreams tap memories stored in connections between brain cells, which the hippocampus tracks as they form. At night it directs neurons to replay recollections, facilitating long-term storage. That could be why reality seeps into our visions—but not why they tend to warp reality.

B. Envision

Our most vivid imaginings occur during the REM phase of sleep. Activity increases in brain regions that control movement and process optical inputs, like the visual and motor cortices, which likely create what we “see” and “do” in slumber. It’s not clear what triggers these areas at night.

C. Feel

The almond-shaped amygdala helps generate feelings like fear, anger, and anxiety. It and other emotional domains are more rowdy during REM sleep, which could explain why strong reactions happen frequently when we doze. We may rely on this process to dull the sting of difficult memories.

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