Body Insights shows sleep recovery as separate overnight readings. Recovery Ratio, Breathing, HR dip, and Lowest O2 appear in Sleep Vibes. The full Sleep report adds Sleep Stress, a chart built from your night HRV.
Apple Watch records the available measurements. Apple Health stores them. Body Insights reads those records inside your sleep window. It calculates each supported reading from that window.
These readings explain more than sleep duration. A long night can still contain a lower Recovery Ratio, a shallow HR dip, or an unusual breathing result. Start with the reading that changed, then compare it with nearby nights.
Which recovery metrics appear?
Sleep Vibes
Recovery Ratio
What you seeA ratio such as 1.20x.
How it worksHRV records from sleep and a nearby pre-sleep period.
Breathing
What you seeOxygen drops per hour of sleep.
How it worksOxygen records from your recorded sleep.
Nocturnal HR Dip
What you seeA percentage and label.
How it worksHeart-rate records from sleep and the period before it.
Lowest O2
What you seeThe lowest sleep oxygen percentage.
How it worksOxygen records from your recorded sleep.
Sleep Vibes details
Breathing Rate
What you seeAverage breaths per minute.
How it worksRespiratory-rate records from your recorded sleep.
Full Sleep report
Sleep Stress (Night HRV)
What you seeNight HRV with High Stress and Relaxed guides.
How it worksNight HRV and your personal guides.
Example: one night, four readings
Sleep Vibes shows a Recovery Ratio of 1.20x. Nocturnal HR Dip is 21% with the Strong label. Breathing is 2.0, and Lowest O2 is 92%.
The readings can move in different directions. Compare the largest change with nearby nights to see whether it repeats.
Why do recovery metrics matter?
A strong Sleep Score can sit beside a lower Recovery Ratio, a shallow HR dip, or a different Sleep Stress pattern. Sleep Score describes the recorded sleep session. Recovery metrics show what happened to HRV, heart rate, breathing, and oxygen during the same night.
The difference points to the reading worth following. Check the same reading across the next few nights before you link it to a change in your routine.
How can you use recovery metrics?
Explain a flat morning
Start with the reading that looks least like your recent nights. If duration held steady but Recovery Ratio fell, follow the ratio rather than the length of the night.
Test one evening change
If you changed one part of your evening, compare the same reading before and after. Bedtime, workouts, alcohol, medication timing, illness, and sensor gaps can affect these records. Compare several nights to see whether the change keeps returning.
Choose the day's pace
Read the recovery metrics beside your Readiness Score before a workout or another demanding part of the day. Readiness adds sleep, recent training, circadian timing, and other available inputs. The recovery metrics show which overnight reading deserves attention.
How does recovery differ from Sleep Score and Readiness?
Sleep recovery metrics
Which overnight HRV, heart-rate, breathing, or oxygen reading changed?
Sleep Score
How did the recorded sleep session compare with your stronger recent nights?
Readiness Score
What do your available recovery signals suggest for the day ahead?
When is a recovery reading available?
Body Insights shows a recovery row when Apple Health has the records it needs. Recovery Ratio uses HRV records from sleep and a nearby comparison period. Nocturnal HR Dip needs enough heart-rate records during sleep and before sleep. Breathing and Lowest O2 use oxygen records. Breathing Rate uses respiratory-rate records.
Some Apple Watch models and nights provide fewer measurements. Body Insights keeps the supported rows visible and leaves a missing reading out. A missing sample does not become a zero or poor result.
If a reading is missing, check the sleep session and the relevant record in Apple Health. Then refresh the night in Body Insights.
See your overnight recovery metrics
See Recovery Ratio, Nocturnal HR Dip, Breathing, Lowest O2, and Sleep Stress from your available Apple Health records.
See my recovery metrics