Most of us already know that light affects melatonin, the hormone that tells your body it’s time to sleep. But melatonin is only part of the story. When your brain perceives light at night, it does more than suppress melatonin; it activates the sympathetic nervous system, the part of your physiology that keeps you alert and ready to respond to stress.
Guilty Of Late-Night TV? It’s Not Just Impacting Your Sleep
