In Thinking Fast and Slow, Kahneman talks about an experiment where they had people answer a quick questionaire about their immediate emotional state throughout

In Thinking Fast and Slow, Kahneman talks about an experiment where they had people answer a quick questionaire about their immediate emotional state throughout the day, kind of like sampling. Something like are you stressed, angry, happy, etc. at this very moment. If I remember correctly, the results showed that most people are fine most of the time, but a small number of people are in constant emotional distress.