The retina sends these signals to a brain region known as the hypothalamus, which passes them on to the pineal gland. The more light your brain detects, the less melatonin it produces, and vice versa.

Published today (September 20) in Current Biology, the findings are the first to link opsins, photoreceptors located in the hypothalamus and other brain ... and photoreceptors in the pineal gland, a ...