Long train ride? Flight? Want to rest? Well, why not try thinking about your neighbor and leaving one armrest for him? Afterall, sharing is caring.

And according to a manner coach Adeodata Czink, “if you’re sitting in a window or aisle seat, the middle seat passenger gets to put his arms down first. If there’s room left over, great. If not, it belongs to the middle seat passenger. And one more thing, try to be nice about it.”