Vodka Red Bull always seemed crazy to me. Caffeine lasts like 6 hours so I drink one at 2 am, what the hell am I doing! Granted people do cocaine so maybe it’s inconsequential.
Drinking some coffee at 6 and 10 though before a night out, good move. Where I am, the nights can go to 4 or 6 easily.
Espresso martini is the popular caffeine and alcohol combo now.
if you're up til 6, your next day is already shot. who cares about caffeine at 2am at that point.
Crown and Red Bull (tastes better) is my order if I want to drink and dance.
There is actually quite a lot of variation from person to person in caffeine elimination half-life, from about 1.5-9 hours. Some of my extended family could drink a cup of coffee right before bed without issue.
https://www.ncbi.nlm.nih.gov/books/NBK223808/