I am reading the comments and wonde about the spread of individual sensitivity.

I drink 3 to 6 Nespresso coffees daily, at various times, including shortly before going to bed. Sometimes I don't drink at all for a few days.

I don't feel any effects related to the number, or whether I drink it or not. Sure, this is subjective but when I compare myself to the stories of the commenters I start to wonder if there is any caffeine at all in what I drink.