It is a widely recognized fact among dermatologists and skincare enthusiasts alike that the skin's natural collagen production reaches its peak during the night, specifically between the hours of 10 p.m. and 2 a.m. This critical period coincides with the body's entry into a restorative phase, during which it actively engages in cellular repair and regeneration processes. During these hours, the levels of cortisol, a stress hormone, are significantly lower, while growth hormon