The hospital hums at 03:17. Lights too bright for this hour, monitors whispering numbers you don’t want to see. You can feel the algorithm even here—charting, pinging, selling the promise of “peak performance” in the dead of night. But the body keeps its own books. And lately, the ledger has a new line: melatonin supplementation for night shift workers and what it might mean for oxidative DNA damage repair.