If you're the kind of person who falls asleep more easily after a glass of wine, then by all means order a small bottle. But keep in mind that although alcohol is a depressant, it can act as a stimulant for the first few hours after you drink it, which means it might actually keep you up.

Drinking too much can lead to multiple issues such as dehydration and grogginess that will only exacerbate the dehydration you're already experiencing and the jet lag you'll most likely experience once you land. There's also the chance that you'll get sick, and no one wants to spend the better part of a long-distance flight in a cramped — and possibly not-so-clean — bathroom.