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Sleep tracking
Log your nights, get a reminder when it's time to wind down, and see how consistent you've actually been.
Why it gets its own place in the plan
Growth hormone release is concentrated in deep sleep. Of the habits a teenager can actually control, sleep has the most direct relationship to growth — which is why it sits alongside food and exercise rather than being a footnote.
A reminder, set to your schedule
Pick a time and the app nudges you nightly. Consistency is the whole point, and the streak is the part you can influence.