Light can penetrate deep to the skin and access at least certain tissues and cells of your body, even though you can't see those wave lenghs of light. Like an impact our biology in very fast, moderately fast and slow ways. But even the slow ways in which light can impact our biology can be very powerful and very long lasting. If you were to go from a room that is dimly lit or dark into a very brightly lit room, you would immediately feel very alert. Sometimes i wake up and it's dark, and i kind of be out, and its lighter out in the next room, and it takes me wild to wake up.

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