“The body is a very different place during the day compared with the night: the kidneys are less active at night, which means that we produce less urine and need to pee less; core body temperature is lower, as are our reaction speeds; and our immune systems respond differently to invaders. Then, as the sun comes up, and day begins, blood pressure and body temperature rise; hunger hormones kick in; and our brains and muscles shift into a higher gear.” Health Book:Chasing the Sun: The New Science of Sunlight and How it Shapes Our Bodies and Minds Source: Chasing the Sun: The New Science of Sunlight and How it Shapes Our Bodies and Minds