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I'm Regina Barber filling in from Mary El Segara.

If you're lucky enough to have traveled several time zones in a matter of hours, then you've most likely

experienced jet lag, feeling groggy, out of sync with your surroundings, and overall crappy.

This year Taylor Swift caused a stir for answering a question after the Super Bowl about her flight on a private jet no less from Tokyo to Las Vegas after she performed.

When asked, how do you not have jet lag right now?

She said, maybe jokingly, jet lag is a choice.

She is very wrong in this instance because jet lag is very real. It's not a choice.

It's very biologically ingrained.

That's Jade Wu, a behavioral sleep medicine psychologist and researcher at Duke University School of Medicine.

I asked her to tell me what jet lag actually is.

Circadian misalignment is an umbrella term for any time your body clock is out of sync with the clock on the wall or

solar clock which is like where the sun is basically in the sky. So jet lag is one

form of it shift work is another form, you know, being an extreme

night owl some days of the week is another form, so jet lag is just the easiest to understand form of

circadian misalignment. Even though world travel is nothing new,

the speed in which humans travel across the world has drastically changed in the

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