fyi ADHD people yes you, having coffee at 11pm because it helps you sleep. THAT IS NOT HOW IT WORKS FOR OTHER PEOPLE.
11pm: "hey I had a nice date, wanna come up for coffee?" is the most obvious clear euphemism because it's CLEARLY NOT ABOUT COFFEE. COFFEE WILL NOT BE INVOLVED.
Unless you have ADHD, so you think "Oh that's a nice comedown beverage, but I have some at home!"