When you wear sunscreen you’re basically painting yourself the color of ultraviolet, and bees can see ultraviolet, so I like to imagine there are bee anthropologists who write papers about human seasonal UV-paint rituals. Clearly, it is done for good fortune before long journeys, to ward off evil spirits.
What time you wake up and fall asleep, when you eat and even your urine and hormone production depends on your personal circadian rhythm, an internal biological clock.
Scientists have long believed that environmental factors such as sunlight and ambient temperature affect the circadian rhythm of both humans and animals. And they know that disturbances of the body clock are associated with diseases including cancer, mental illnesses and metabolic disorders including diabetes and obesity.