People laughed at me when I said that I was carrying around a dozen spare passport photos, but they’ve been incredibly useful and saved me a ton of time and hassle. Who wants to wander the streets of some rural town in Cambodia searching for someone who can take your photo? I’ve used them to apply for visas around the world, to get a new passport when mine expired while I was on the other side of the world, and I even needed one to buy a local SIM card in Nepal! Having spares in my bag meant that I didn’t have to waste a day researching and then wandering around a city to try to find someone who could take a passport-sized photo of me.

It’s a far cry from doctors’ typical jet lag tips ― like avoiding caffeine and alcohol before you try to sleep, slowly adjusting your sleep schedule to a new time zone or even using small doses of melatonin to help fall asleep when your body typically wouldn’t want to, the study’s author Cristina Ruscitto, a researcher in the Department of Psychology at the University of Surrey (and former long-haul air crew member), told The Huffington Post. The idea is, she said, “that you readjust by eating in line with local time ― not just sleeping on local time.” This revelation could be an easy fix for jet lagged travelers everywhere. 

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