Why is jet lag worse one way?

Jet lag is often worse when traveling eastward because it requires the body to adjust to a shorter day, leading to a greater disruption of the circadian rhythm. This means you have to go to sleep and wake up earlier than your body is accustomed to, which can be more challenging than adjusting to a longer day when flying west. Additionally, the body's internal clock typically aligns better with westward travel, making it easier to adapt.