Picture this: You made it through a grueling week at work and sailed through it migraine-free. But when you wake up Saturday morning, WHAM! A migraine hits. Sound familiar? If it does, then you’ve just had what’s known as a “let-down” migraine. Whether it happens the day after final exams or the first day of your honeymoon, let-down migraines are a confusing experience. After all, stress is the most common migraine trigger. So why do migraines happen when stress finally...