DEAR MISS MANNERS: I am 25 and am lucky to be studying overseas in France. It is a financial struggle, but worth the effort, I think. I don’t splurge on much of anything; I can’t, really. But I do indulge my love of breakfast. I will go out in the morning and buy a single buttery croissant, a bit of jam, some rich cheese, a few pieces of fruit and an espresso. I bring it all back to my tiny apartment and enjoy it by an open window. I recently had a friend from the U.S. come to visit. She is not a morning person, and was asleep when I went to get my breakfast. She rose while I was enjoying it i…