The dark is good for our sleep, our biology, and the health of our ecosystems. It's good for our creativity and our spirits, and, yes, it's even good for our safety and security. ... Bogard researched night-shift workers, those who are exposed to light during the hours that most bodies crave darkness and sleep.

Is it good to be in the dark?

Scientists have now discovered that only when it's really dark can your body produce the hormone called melatonin. ... Melatonin fights diseases, including breast and prostate cancer. "It turns off the cancer cells from growing," says Joan Roberts, a photo biologist.

Why do I like the dark?

A new theory suggests that these two traits evolved together because darkness gives criminals and cheaters a way to hide from the prying eyes of others, giving them an evolutionary advantage. ...