nightcap

The Guardianから表現を拾います。

Nightcaps: what's your late-night tipple?

UK finalists in a global cocktail competition made nightcaps on a flight from New York to London – here are the winning recipes. What do you drink before bed?

These days, the tinier and more exclusive the bar, the greater the draw. I doubt there has ever been a bar as hard to get in to as the one I'm currently standing at, in the tiny kitchen galley of an Airbus A318, on British Airways' swanky, business-only night flight from New York to London. Aaron Jones of the Savoy is wedged behind a makeshift counter created from the cabin crew's meal trolleys, making us a nightcap.

http://www.guardian.co.uk/lifeandstyle/wordofmouth/2013/may/20/nightcaps-late-night-tipple

nightcapには文字通り「ナイトキャップ、寝帽」（『ジーニアス英和辞典　第３版』大修館）という意味がありますが、ここでは「（（略式））寝る前に飲むもの｛酒｝」（ibid）という意味になります。確認のため英英辞典でもチェックしてみると’a hot or alcoholic drink taken before bedtime'ODOと記載されていました。

飛行機の中で飲むお酒はなんだか格別な味がしそうですね。(Shou-VR*)