Light affects us in many ways. Nordic countries have light treatment for citizens who suffer from a depressive outlook due to lack of sunshine during winter. Their circadian rhythms are disrupted. Recently evidence points to the fact that color is important as well.
With only dawn sunlight in the test room mice seemed confused and their body temperatures lagged behind the norm by 30 minutes. When orange and blue was added to the dawn light the mice were perfectly normal in behavior and temperature.
It seems the light/color information is stored in suprachiasmic neurons in a special way. Biopsies show a time lag in the firing of these neurons which ties into low body temperatures. Mammals have evolved in tune with this planet. The animal to Earth "bonding" seems to be very close indeed.
✴ Biology by Ty Buchanan ✴