The text came in at 3:14 a.m. My client Dana — 48, marathoner, more disciplined than half the college athletes I’ve coached — had woken up soaked for the fourth night that week. Her smartwatch, meanwhile, insisted she’d logged “excellent sleep, 96% recovery.” She sent me a screenshot with three words: “Make this make sense.” I stared at it for a long moment, because I’ve lived some version of that same mismatch myself. For years, the wearable industry built its algorithms around bodies that run like metronomes — predictable cycles, stable temperatures, textbook sleep architecture. Then perimenopause arrives and quietly…