I used to drink two double-espressos (technically a latte with a double-espresso in it) a day -- one in the morning, one early afternoon -- for many years. ~5

I used to drink two double-espressos (technically a latte with a double-espresso in it) a day -- one in the morning, one early afternoon -- for many years. ~5 years ago I stopped drinking the afternoon coffee, and have subjectively noticed improvements in my sleep -- less wakeful in the night. It also fits better with my sleep habits, where when I was younger I commonly worked past midnight whereas now I'm asleep by 10 pm and wake up early. I still drink the morning coffee and I wouldn't switch to another stimulant because the main reason I drink coffee is because I enjoy drinking coffee :)