The clock only moves one hour. The body can act like it crossed a time zone. After 40, the shift into or out of daylight saving time often feels less like a minor schedule change and more like a whole-body disruption. Sleep gets lighter. Recovery takes longer. Morning light may arrive at the wrong time for your internal clock. Mood can dip for a few days, sometimes longer, especially after the spring change. That reaction is not just “getting older” in a vague sense. It has r