Timing is everything. And it isn’t just about luck or serendipity – there’s actually a science to it. Chronobiology, the science of your body’s circadian rhythms, or the physical and mental changes we all go through over a 24-hour period, unlocks the complex workings of your internal clock. The truth is, your body is better equipped to handle certain things at specific times. Learn how to simplify every aspect of your life – from the best time of day to cheat on your diet and schedule doctor’s appointments to the best time of day to have sex, and even prevent heart attacks. Take this quiz and get a leg up on all sorts of insider secrets.