I sometimes have to travel for my job and I hate it. Last time I traveled, I got an angry mania where I was sleeping 2-4 hours a night. I was in two different countries and I wanted to scream and punch someone.

I get an episode every time I travel, honestly. So the best thing I can do (or what I would recommend) is mentally prepare for an episode and learn some coping mechanisms to manage the symptoms when they come up. This could mean buying some things in advance to distract yourself with and paying for everything in cash so you're not spending tons of money on a credit card (just go to a bank that charges a small fee for converting your currency).

If you like books and can read well (I can't read well), buy yourself a book in advance that seems interesting to you. Or even get a magazine. I actually like to read those dumb magazines you get for free on the airplane with the bizarre and stupid inventions they're trying to sell. I take those dumb things with me and laugh at them when I'm bored. Just... be careful about customs and border patrol. I don't know if you have to declare those magazines.

Trust me, magazines are a safe thing. If you use your phone, you're probably going to be in roaming mode, and that can get expensive when you use a lot of data. Yes, there are international phone plans for travel, but they're still expensive. If you're in your hotel and using your phone to connect to the WiFi, then that's fine... but you need something to do when you're not in the hotel. Otherwise, manically using your phone to send texts, call people, etc. gets expensive. So the idea of magazines is to keep you away from your phone.

Of course magazines are a thing of the past, but they're not all that bad. Smithsonian is decent. I also like Popular Science and National Geographic. I only read them when I travel b/c magazines are cheap entertainment and it's cheaper than reading those same articles on the internet overseas. You spend like $10 at most on 3-4 magazines.