The title is misleading. It's not really having sex in the dark but rather making sure that you have enough good sleep so as to make sure that your body follows the correct rhythm for you to ovulate. So living a healthy lifestyle is key to getting pregnant! That seems more like common sense. When i was trying to get pregnant with my first child, I made sure that my lifestyle is conducive to conceiving. I closely watched what I ate, made sure I got 7-8 hours of sleep every night and took an all-natural fertility supplement.