You've probably heard that morning sunlight is good for you. But the reason why is more fascinating, and more relevant to how you feel all day, than most people realise. It starts with your eyes. The light-to-brain connection When light enters your eyes in the morning, it doesn't just help you see. Specialized cells in your retina send that light information directly to a part of your brain called the suprachiasmatic nucleus, your body's master internal clock. This tiny struc