While you sleep, your skin goes into repair mode, thanks to a little hormone called melatonin (often known as the “sleep time” hormone). “Melatonin is vitally important to the skin and plays an important role in skin repair from environmental exposure, UV light, stressors, pollution, etc,” says board-certified dermatologist Keira Barr, MD, on an episode of Clean Beauty School. “If you’re not resting, you’re not making that melatonin and your skin isn’t repairing itself.”
In terms of repair, the skin experiences a surge of HGH (Human Growth Hormone) in the nightly sleep cycle. HGH release helps rebuild body tissues and stimulates increased cell production to invigorate and rejuvenate the dermis. When you lose sleep, your skin misses out on this important process, so your complexion can look pale and dull after a restful night.
And if you lose sleep night after night, that deprivation can induce oxidative stress and lower your antioxidant defenses, making your body (and skin) vulnerable to oxidative damage. Not to mention, lack of sleep increases cortisol (the infamous stress hormone), which can break down collagen over time; research has shown a link between sleep and collagen production3which is why many experts consider sleep a vital part of any “anti-aging” skin routine.
you should also know that skin is more permeable at night4, which means that it is much easier to lose a significant amount of hydration while you sleep. That’s why you may want to apply stronger, occlusive moisturizers before bed to prevent valuable moisture from seeping out overnight. Along the same lines, that permeability makes your skin more receptive to skincare products, so you could layer more intense actives before bed.
Source: news.google.com