Each autumn, a new cohort of young people crosses the threshold into university life, carrying with them bodies calibrated by years of routine and suddenly asked to adapt to noise, novelty, and the relentless pull of social belonging. Sleep — that quiet, unglamorous necessity — becomes the first casualty, and yet experts suggest the remedy lies not in discipline or deprivation but in understanding the body's own ancient rhythms. The light of morning, the consistency of waking, the honest reckoning with caffeine and alcohol: these are the levers that govern rest, and learning them early may be