No matter how hard you try to avoid it, after a long flight, jet lag hits us all.
So if you're up all night more when traveling east, scientists say you're not alone.
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A new study out of Northwestern University used an unusual way to collect data on how jetlag affects a person's performance.
They turned to professional baseball players and analysed who scored what, how well the pitchers threw and home game advantage. Across the board, the players suffered from jetlag more when travelling east.
Scientists say that's because our bodies are used to a 24 hour day.
If we gain a few hours, it's easier to handle than losing a few hours.
Travelling west requires less time to get in sync than traveling east, which can take up to a day and half.