DEAR DOCTORS: I need it to be completely dark to sleep well. I've got blackout curtains, I use an analogue clock and I even duct-taped the digital lights on the smoke alarm. I just read that light at night is bad for your health. Is that true? I want my husband to know I'm not overreacting about this.
DEAR READER: Most of us live in a world saturated with artificial light. Even those in more rural areas, who have the luxury of dark(er) night skies, scramble their circadian clocks once the Sun sets. Electric lights and all manner of digital screens derail the body's precisely calibrated daily rhythms of light and dark.
