Spring changes your sleep. Not dramatically.But biologically. Longer daylight advances your internal clock.Cortisol rises earlier.Melatonin shortens. You wake sooner.Sleep lighter.Feel alert at the wrong time. This isn’t dysfunction. It’s recalibration. After 45, The Buffer Is Smaller Estrogen fluctuates.Progesterone declines.Sleep naturally becomes lighter. So when spring accelerates your rhythm, you notice.…