Psychology suggests adults who dim the lights long before bed aren’t being dramatic: They’re protecting the slow transition the mind needs because bright evenings can keep the body externally cued

Researchers uncover the mystery behind dimming the lights before bedtime. It turns out this soothing practice sends a message to the brain to start easing into sleep mode. Exposure to bright lights activates the brain, making it tough to drift off. By lowering the lights, our bodies can ease into relaxation, enhancing melatonin production, a vital hormone for sleep.