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Body
No amount of talking about personality will tell you whether you are strong in the morning or at night. That is this layer.
Being a morning or an evening person is a body clock, not a character trait, and not something willpower settles. It is also the layer of the eight where self-report and measurement agree most closely — you are the best available authority on when you get sleepy. And it does not exist at all in 16-type theory. In practical terms, this is the result you can use soonest.