No one likes jet lag. We get off a flight feeling wrinkled and exhausted and then head into a day full of meetings or jump full swing into a vacation. Here’s how to reset your body clock and sleep better. There are 15 million of us who fly across multiple time zones every year, with 500,000 of us in the air at any given moment. And for those of us who fly more than a couple of time zones from home—particularly those who fly eastward around the globe—jet lag can be a serious challenge. It takes away our edge, makes us groggy, and disrupts our sleep. Here’s how to be focused and alert during the day—and sound asleep at night.