It is an interesting article on how light affects the circadian rhythms. Read the full article if you are interested. A growing number of doctors believe that betraying our internal clocks is the source of a host of health problems. Once night falls, the body stays awake by activating the stress response, which in turn weakens the immune system. This is evidenced by the fact that individuals working graveyard shifts are more susceptible to stress, constipation, stomach ulcers, depression, and heart disease… Shortness of Dark – [Damn Interesting]