A score is missing entirely
Almost always a data problem rather than a scoring one.
- You did not wear the device overnight. Sleep and Readiness both come from the night. No night, no scores. NOYU shows nothing rather than guessing.
- The data has not arrived yet. NOYU pulls new data every few minutes, but your device has to send it first, and some only sync when you open their own app. Opening the manufacturer's app is the quickest way to push things along.
- Your device does not record that metric. A device with no heart rate sensor cannot produce Readiness.
- You have just connected. Your first days will be thin while history backfills and baselines form.
A score is there but says "calibrating" or looks unstable
Anything measured against your own baseline needs history before it means anything. NOYU wants around five nights before it trusts a baseline, and bedtime consistency needs at least three.
In your first week or two, expect scores to move around more than they will later. This is the system learning your normal, not a fault.
The number does not match how I feel
Sometimes this is the score being wrong, and sometimes it is informative. Worth separating.
Reasons a score can be misleading:
- A device worn loosely, or high on the wrist, produces poor overnight heart rate data.
- A late night on the sofa can be logged as sleep by some devices.
- Alcohol suppresses HRV sharply, so Readiness can be low while you feel fine, especially early on.
- Illness, travel and altitude all move these metrics for real reasons.
When you feel worse than the score: trust yourself. NOYU is measuring a handful of overnight metrics, not everything. Stress, soreness and mood barely show up in HRV.
Either way, say so in the chat. "My readiness says 80 but I feel wrecked" is useful, and NOYU will factor it in rather than argue with you.
A past score changed
This can happen, for two legitimate reasons.
Late data. If a night syncs days after the fact, NOYU recalculates. Because your baselines are rolling, a late night can also shift the days around it - recent days recompute, older days stay put.
A formula improvement. When we improve how a score is worked out, we version it and recalculate history so your past is measured the same way as your present. Without that, a chart would compare old numbers with new ones and the trend would be meaningless.
We would rather your history be consistent than frozen.
Two scores disagree with each other
Not necessarily a fault. High Strain with high Readiness means you trained hard and absorbed it well. Low Strain with low Readiness usually means something other than training, such as illness, alcohol, stress or a bad night.
These combinations are the interesting ones. Ask NOYU about them.
My device's own app shows different numbers
Expected, and covered in detail in Why NOYU's numbers can differ from your device. The short version is that every company uses its own formula, and NOYU is transparent about ours rather than matching theirs.
Still not right
Email us at hello@noyu.health with the date and what you expected to see. Score questions are usually quick to answer once we can look at the day in question.
