Day and night are two different phenomena, which is the same for the biological rhythms in the skin. During the day, the skin needs to be protected against external stressors and stay hydrated. At night, the skin repairs and regenerates itself, and needs products to help restore the damage that occurred during the day depending on the environment you are exposed to (external-dry air, sun, cold weather, etc, or internal-air conditioner, heater, etc.).
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