Does light trigger the release of melatonin in the brain?

Light exposure inhibits the release of melatonin in the brain. Melatonin is produced by the pineal gland in response to darkness, signaling to the body that it's time to sleep. When light, especially blue light, is detected by photoreceptors in the retina, it sends signals to the suprachiasmatic nucleus (SCN) in the hypothalamus, which in turn suppresses melatonin production. Thus, light plays a crucial role in regulating the sleep-wake cycle.