Readiness tells you how prepared your body looks for the day ahead, out of 100, read from the night that just ended. It's a morning snapshot: set once when you wake and unchanged for the rest of the day, because it describes the state you woke up in. Some trackers call it recovery - same number, but NOYU says Readiness because the question points forward: what should today be?
What feeds Readiness
Each input is compared with your own rolling 30-day normal, not a population chart - a 45 ms HRV is a great morning for one person and a rough one for another. Listed from most influential to least:
HRV - the biggest contributor: your overnight HRV against your own typical level and your own usual variation.
Last night's sleep score - carried in whole. A short or broken night is the most common reason a Readiness morning dips.
Sleeping heart rate - your average heart rate through the night, against your own baseline; elevated counts against you.
HRV stability - how steady your HRV has been across the last week. Steadiness is a good sign in itself, whatever the level.
Body temperature - running hot or cold against your own usual is flagged in both directions; a rise often precedes illness.
Respiratory rate - only counts against you when it's raised, since elevated overnight breathing is a well-established early sign of illness. Below your normal is neither rewarded nor penalised.
Blood oxygen - the one input scored against an absolute range, because healthy overnight saturation sits in a narrow band for everyone.
Most people won't have all seven - temperature, respiratory rate and blood oxygen depend on your device. NOYU drops what's missing and reweights the rest, so a device that doesn't report temperature never costs you.
Your normal scores 80, not 50
Waking exactly at your normal scores about 80, not the middle of the scale. Your normal is a good place to be. The room above it is for a strong night, and only a real departure from your own pattern pulls the score down.
It's purely physiological
Readiness reads what last night's physiology showed and nothing else. A hard session leaves its mark on your HRV and overnight heart rate, so its cost appears in tomorrow's number.
But not everything training does to you shows up there. The stress a heavy block puts on joints, tendons and connective tissue - the wear that builds towards overuse injuries - barely registers in HRV or heart rate, so a good morning isn't proof you've absorbed a big week. Weigh the score alongside your training week, not instead of it.
What to do with it
A low morning after a hard session or a late night is the system working; it usually resolves in a day or two. The pattern worth acting on is a run of below-normal mornings, especially with a rising sleeping heart rate alongside, which together suggest an easier few days.
A high score isn't an instruction to train hard, and a low one isn't an order to stop. It's one reading of last night, to weigh alongside how you feel.
