Beauty Sleep / Overnight Skin Repair / Sleep and Aging
Sleep is arguably the most powerful non-topical intervention for skin health and biological aging. During deep sleep (NREM stages 3–4): growth hormone secretion peaks (driving cell repair and collagen synthesis), cortisol reaches its daily nadir, melatonin acts as a potent antioxidant protecting skin cells from oxidative damage, and skin permeability increases allowing more effective absorption of overnight skincare products. Chronic sleep deprivation increases TEWL, raises inflammatory markers, impairs wound healing, and directly accelerates epigenetic aging.
7–9 hours for most adults, with consistent sleep/wake times. Sleep quality matters as much as quantity — sleep fragmentation reduces time in restorative deep sleep. Practical sleep hygiene: dark room, cool temperature (65–68°F), no screens 30–60 min before bed, consistent wake time even on weekends.
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