the.com/nightcap

The last drink, sworn to be one, secretly the beginning of a saga.

means A drink, usually alcoholic, taken at the end of the evening just before bed — or, originally, the soft cap worn to keep one's head warm in sleep.

from A plain compound of "night" and "cap," from the Old English roots niht and cæppe (the latter borrowed from the Latin cappa, a hood or cape). The literal sense came first: a cloth cap people pulled on against cold bedrooms in the days before central heating. The boozy sense arrived later by warm analogy — a bedtime drink that, like the cap, takes the chill off before sleep.

original meaning
A literal cloth cap worn in cold bedrooms
sports usage
The second game of a baseball doubleheader
sleep science
Alcohol wrecks deep sleep despite feeling drowsy
word age
The drink sense dates to the 1800s
for instance

sazerac — new orleans cocktail with rye whiskey, absinthe, and peychaud's bitters, established 1850s at the sazerac coffee house

irish coffee — hot drink with irish whiskey, coffee, sugar, and cream, created 1943 at foynes flying boat terminal in ireland

hot toddy — warming whiskey drink with hot water, honey, and lemon, popular bedtime remedy across scotland and northern uk

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