Jet lag is a common problem for travelers who fly across multiple time zones. It occurs when the body's internal clock, or circadian rhythm, is disrupted by rapid travel. Symptoms of jet lag can include fatigue, insomnia, difficulty concentrating, and digestive issues. The severity of jet lag depends on the number of time zones crossed and the direction of travel, with eastward flights typically causing more intense symptoms than westward flights.

To minimize the effects of jet lag, travelers are advised to gradually adjust their sleep schedule in the days leading up to their trip. Staying hydrated, avoiding caffeine and alcohol, and getting exposure to natural light upon arrival can also help reset the body's internal clock. Some travelers find that melatonin supplements or prescription sleep aids can assist in adjusting to a new time zone. While jet lag can be uncomfortable, it is usually temporary and fades after a few days.