Why Do We Dream in Color Even If We Sleep in Black and White?

We dream in color even if we sleep in black and white because our brains remember colors from the day, not just the pictures we see when we're asleep. Imagine you're watching a movie at night, it's all black and white. But your brain is still thinking about that colorful rainbow you saw earlier in the day. So when you dream, your brain brings those bright colors back to life.

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Examples

  1. You fall asleep after watching a black-and-white movie but wake up remembering your favorite rainbow from earlier in the day.
  2. Your friend dreams about flying through a bright green forest even though they watched a boring black-and-white documentary before bed.
  3. Even though you're sleeping on a gray pillow, your dream is full of red roses because that's what you saw at breakfast.

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