Picture two patients recovering from spinal surgery on the same corridor, on similar drug protocols. It’s a composite, but a close one: in an actual study of patients like this, the ones who took noticeably less pain medication weren’t on a different drug. Where the window research startedThat result echoes a much older, smaller study that shaped hospital design long before anyone thought to measure lux levels in a patient’s room. Pain runs on a clockWhy would sunlight have anything to do with how much medication someone needs? Higher light exposure tracked with less fatigue and better mood among the patients who were in pain.