Chances are you know someone who is afraid of the dark. It might be your five-year-old daughter who insists that monsters emerge when the lights are off. It might be your teenage son who has an irrational fear of ghosts. Or it may be you, even though you’re old enough to know better, and mature enough to convince yourself that it’s not a big deal. Fears are fears, whether rational or not. But fears are fears, and whether rational or not, they can overwhelm us if we allow them to.