Our body has a daylight detector: Light-sensitive cells in our eyes called spheres. These connect to the part of the brain called the biological clock that regulates our body’s daily rhythms. The discoverers of how the biological clock works were awarded the Nobel Prize.
The 2017 Nobel Prize in Physiology or Medicine has been awarded to Jeffrey C. Hall, Michael Rosbash and Michael W. Young for their discoveries of the mechanisms that regulate our circadian rhythm. Our circadian rhythm is regulated by our internal biological clock that anticipates day/night cycles of the earth, this optimises our body rhythms and behaviour. That we and other organisms adjust our body rhythms and behaviour according to the time of day has long been known! But that we also have a circadian clock that regulates this internally in our bodies was not discovered until well into the 20th century.
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Light supports us in everything we do. Good light means the right light at the right time. It has a great positive impact on our experience of energy, sleep, happiness and health.