Light and Sleep - How Daylight Affects Our Sleep

Light and darkness are the most important timekeepers of our internal clock. The reason for this is special receptors in the retina of the eye. They are sensitive to light and regulate biological processes in the body when light falls on them - including our biorhythm. When daylight hits these ganglion cells, it wakes us up and switches the body to "activity". At the same time, the production of the happiness hormone serotonin is boosted.