Cafes are a great place to socialise. I took up coffee drinking a few years ago to be a part of this ecosystem. It took me 2 years of 5 coffees a week (close to 1 a day) to get used to caffeine.
I experienced increased heart rate, sweating, delayed sleep (even 8 hours after a coffee).
These days, I still need to drink coffee at least 6h before sleep, but I don't find myself getting wound up after 1 cup anymore. Two cups is a different matter.