When the light is mixed, it becomes brighter. Why does the paint darken when mixed?

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Hello, this is Science Cookie!
I have come to you with three very interesting questions today!
The contents of the questions are as follows!
1. When light is mixed, the light becomes brighter. Then why does the paint darken when mixed? - 10th episode of Help Us
2. If you turn on a fan while you are sleeping, your immune system becomes weaker. Why?
3. If you open only a portion of your eyes or open your eyes after closing it, you have a better eye-sight, how is that true?
It is for sure that these three questions are interesting topics that you can meet in your daily life!
Well, then! Together with Science Cookies, shall we look at the answers to these three questions?
The three primary colors of light # The three primary colors of color # We are the original ones :)