...a hotel where there is no room service after midnight.

Growing up, a "sundowner" was usually a Gin and Indian Tonic during the summer, and a whisky in the winter. Ladies, quite often, would have a chilled sherry if they didn't care for the taste of gin or whisky. These drinks were usually served around 5PM.

As I seem to recall, proper "mixed drinks" were served, along with chilled champagne, at about 7:30, just before we went in for dinner.