Just don't go out of the security area's and maybe spend the 30-60$ to get into a lounge, its worth it.
The airports in all of the lib/progressive cities (pre-security) are basically homeless shelters now.
Are lounges even open overnight? It seems like they are associated with an airline or organization and not available to the public.
I'm not sure if all of them are, I think some may be 24/7 but you would have to look in the airports you are passing through.
Some of them have those sleep pod things now too so at least you could get a box with a lock on it and control the lights if you want to get some sleep. Not ideal but better than trying to get some sleep on a concourse.
Even if you can't crash in the lounge, it probably costs less overall for the food/drinks/WiFi and quiet than you would get in the airport.
I found Dunkin' Donuts all over the New York airport, and they had their standard prices. The standard price places had long lines. I bought a drink once or twice. I don't remember what I bought. I brought plenty of snacks from Vietnam to avoid having to buy airport food.
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