If you’ve ever flown on a plane, you’re familiar with that groggy feeling that follows once you land. Your legs are wobbly, your stomach is churning, and you might even have a headache. Thousands of miles from home, you feel the opposite of refreshed. I recently took two trips in the same month, flying back and forth both times. The first trip was irritated by the long-lasting effects of flying. I was groggy and grouchy in the days following my flight. For my second trip, I changed one small thing in my routine. Even though I flew across two different time zones, I felt remarkably better during my second trip. My flying tip? It all starts with an empty bottle.