Just as other organs in our body are able to distinguish day from night, so can our skin. However, many dermatologists say that there isn't enough proof to claim that skin-repairing processes go full force during our sleeping hours. "We are constantly repairing our skin and responding to stressors," dermatologist Dr. Jenny Kim told the paper. "Our skin doesn’t wait for nighttime repair," she adds. On another note, cosmetic companies, which don't have to follow quite as strict FDA guidelines as drug companies, can often get away with self-pimping their product benefits without much question.
What research does show, however, is that after sundown, blood flow increases. "When blood flow is increased to skin, surface area of the absorption will increase," Dr. Kim explained. Also, during the nighttime hours, the temperature of our skin rises, and our skin can become a bit drier. Therefore, a moisturizer "can improve the skin barrier," she told the Times. What do you think on this topic? Are you a firm believer in nighttime potions, or are you just fine with your simple cleanse, tone, and moisturize routine, thank-you-very-much?