[Luzion]

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No. You misunderstood. You can train yourself to recognize the light and realize it's a dream, but it's not a natural reaction.

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Yeah, thats a technique for inducing lucid dreams. There are devices you can wear like googles while going to sleep. They flash lights into your eyes at predetermined times when you figure you will have good REM activity. You actually see these light flashes while you dream. So all that you need to do is train yourself to recognize these light flashes as indicators that you are inside a dream.