Data and metrics review
Evening · 18:00
Regularly reviewing tracked data like sleep and HRV to guide changes to habits or routines. Often used to spot patterns and make informed adjustments over time.
Quick facts
- 1Wearables turned sleep, heart rate variability and resting heart rate into daily personal dashboards.
- 2Resting heart rate and HRV trends respond visibly to alcohol, late meals, illness and overtraining.
- 3Regular bloodwork and periodic weigh-ins extend the same feedback loop to slower-moving markers.
Why people do it
Feedback instead of folklore: Metrics settle personal arguments: the data shows what late eating or a drink actually did last night.
Early warnings: Falling HRV and rising resting heart rate often flag illness or overreach a day or two early.
Motivation loop: Habits stick better when their effects are visible by morning.
Good to know
Trends, not days: Single readings mislead; practitioners read weekly curves and ignore daily noise.
Do not outsource sleep to a score: Chasing a sleep score can itself harm sleep. The body outranks the app.
Common questions
Which numbers matter most?+
Resting heart rate, HRV trend and sleep regularity carry most of the signal for daily decisions; bloodwork covers the long game.
How often for bloodwork?+
Annually is the common baseline in the longevity crowd, more often only when tracking a specific change with a clinician.
Takeaway
Measure a few things, read them as trends, and let the data referee your experiments. Then close the app and go to bed.
Notes from the community
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For information only.
These habits are compiled from public statements and are not medical advice or endorsed by Bryan Johnson. Consult a qualified professional before changing your routine, supplements, or therapies.