Body Insights shows metabolic readiness as a score from 0 to 100 in Metabolic Sleep. A compatible continuous glucose monitor (CGM) records your glucose. Apple Health stores the glucose readings and your available sleep session. Body Insights matches the readings to that sleep window, then scores the night.
Metabolic readiness tells you how steady your glucose was while you slept. Time In Range, Stability, and Dawn Phenomenon build the Metabolic Vibes score. Overnight Low and Flow Rate stay visible in the detail view, so you can check what changed.
What does the Metabolic Sleep card show?
The Metabolic Sleep card shows the score beside Last Night. It also names the glucose pattern found that night. You may see Stable, REM Spike, Deep Low, Dawn Rise, or the number of patterns found.
Under the score, the summary reads You're thriving, You're balanced, You're resting, or You're healing. Open the card and read the Metabolic Vibes rows before you decide what the score means for your day.
What goes into metabolic readiness?
Time In Range
The share of your recorded sleep that glucose stayed between 70 and 120 mg/dL, or the equivalent in your selected unit.
Stability (CV)
How much glucose changed relative to its overnight average. A lower percentage means a smoother trace.
Dawn Phenomenon
The glucose rise toward wake time.
Overnight Low
The lowest glucose reading recorded during sleep.
Flow Rate
Whether glucose moved at a steady, dynamic, or intense pace through the night.
Metabolic Vibes uses Time In Range, Stability, and Dawn Phenomenon for the score. Overnight Low and Flow Rate help you read the trace when the result surprises you.
Example night: a score of 93
An example night with 100% Time In Range, 10% Stability (CV), and no dawn rise has a Metabolic Vibes score of 93. Those rows explain the high result. A night with similar average glucose can score differently if its stability or dawn rise changes.
Why does metabolic readiness matter?
Average glucose cannot tell you how the line moved. Two nights can have similar averages even when one stays smooth and the other rises and drops. Metabolic readiness turns Time In Range, Stability, and Dawn Phenomenon into a score. The other rows help you check the result.
Compare the score with nearby nights. A repeated shift tells you more than one unusual reading. Meals, evening exercise, stress, illness, and medication timing can change a trace. Sensor lag or pressure on the sensor can change it too.
How can you use the score?
Compare one evening change
Change one part of your evening, such as meal timing or workout timing. Then compare Time In Range, Stability, Dawn Phenomenon, and the score across several nights.
Check the rows before a demanding day
If the score is lower than usual, open Metabolic Vibes. Find the row with the biggest change. Compare it with how you feel and your overall Readiness Score before you plan a workout or another demanding task.
How is this different from Readiness Score?
Metabolic readiness covers your recorded overnight glucose pattern. Readiness Score is a separate, broader result for the day ahead. It uses your available sleep and physiological recovery signals. When CGM data supports an overnight glucose assessment, Body Insights includes it too.
Without usable CGM data, Body Insights builds Readiness Score from the other supported inputs.
What happens when glucose data is missing?
If the app lacks enough usable CGM and sleep data, the Metabolic Sleep card shows -- and the detail view says No metabolic analysis. Body Insights leaves the metabolic part out of overall Readiness, so a data gap does not become a low score.
Check the glucose and sleep records in Apple Health, then refresh the night in Body Insights. A delayed CGM sync, a gap in the sleep session, or pressure on the sensor can leave the overnight window incomplete.
Your next step
Open Metabolic Sleep and select the night you want to review. Compare Time In Range, Stability, and Dawn Phenomenon with the same rows from nearby nights. Use Overnight Low and Flow Rate to see whether a low point or faster change helps explain the result.
See your metabolic readiness score
Body Insights turns your overnight CGM readings into one score with the glucose details behind it.
See my metabolic score