Sleep Regularity
Sleep Regularity is a health-education page for Yuelu Body Age. Sleep regularity measures whether recent sleep onset times are stable; smaller deviation usually means a steadier body rhythm. Read it as trend context rather than a judgment from one day.
Role in Body Age
Sleep Regularity contributes to the sleep dimension of Body Age. Yuelu combines it with the other sleep, activity, and fitness signals so one weak or missing signal does not define the whole result.
Current Yuelu Method
| Field | Current rule |
|---|---|
| Data source | Apple Health sleepAnalysis |
| Lookback window | Valid nights from the last 14 days, using up to the 7 most recent main sleep samples |
| Metric | Mean absolute deviation of sleep onset time from the recent average, in minutes |
| Missing-data rule | Missing when fewer than 3 valid nights are available |
Smaller deviation is better. Within about 30 minutes usually indicates a stable rhythm; deviations beyond 90 to 120 minutes can noticeably affect the sleep dimension.
How to Improve
- Keep bedtime and wake time as consistent as practical.
- Reduce bright screens, alcohol, and late heavy meals before bed.
- Leave a larger sleep window when training load increases.
- Watch several nights of trend before reacting to one short night.
When Data Is Missing
Check Apple Health permissions, source priority, Apple Watch battery and wear time, and whether the relevant samples were recorded recently.
Rule Basis
- Yuelu Body Age follows the current in-product calculation rules for sleep, activity, and fitness signals.
- Data is read from authorized Apple Health and Apple Watch samples when permission is granted.
- Interpretation is for wellness education and product explanation, not medical diagnosis.
Disclaimer
This material is for health education and product explanation only. It is not medical diagnosis or treatment advice. Consult a qualified clinician for persistent symptoms or health concerns.