One Primary Metric, Two Supporting Signals
Pick one outcome that truly reflects progress, like minutes to fall asleep, daily steps, or perceived stress at lunch. Then add two supportive signals that explain the story, such as caffeine timing and evening light exposure. This balance keeps logging light while protecting you from misleading blips. When I tested afternoon coffee, my main measure was sleep onset time, with supporting signals for last espresso hour and pre-bed screen use, revealing a pattern I could actually change.