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Sleep is a central regulator of aging at the molecular, cellular, and tissue levels. During slow wave sleep, growth hormone secretion peaks, driving DNA repair, protein synthesis, and collagen production, which are essential for skin integrity and tissue renewal. Adequate sleep supports glymphatic clearance in the brain, removing metabolic waste and oxidative byproducts that contribute to neurodegeneration and aging. Chronic sleep deprivation elevates cortisol and pro inflammatory cytokines such as IL 6 and TNF alpha, accelerating collagen breakdown, impairing skin barrier function, and promoting systemic aging. At the cellular level, insufficient or fragmented sleep is associated with telomere shortening, mitochondrial dysfunction, and increased oxidative stress, all recognized markers of accelerated biological aging. Nighttime melatonin secretion further contributes by acting as a potent antioxidant and regulator of mitochondrial health, helping protect cells from cumulative age related damage. Sources: Xie et al., Science, 2013 Oyetakin White et al., Clinical and Experimental Dermatology, 2015 Jackowska et al., Proceedings of the National Academy of Sciences, 2012 Reiter et al., Journal of Pineal Research, 2014 Irwin et al., Biological Psychiatry, 2016