Garmin sleep & recovery analytics

What your Garmin records at night

A modern Garmin watch is a surprisingly complete sleep lab on your wrist. While you sleep, it collects several data streams:

• Sleep stages and Sleep Score. Light, deep and REM sleep plus awake phases, estimated from movement and heart-rate patterns, and summarized as a 0–100 Sleep Score.
• Overnight HRV. Heart rate variability readings every few minutes through the night — the basis of Garmin's HRV Status. More in Garmin HRV during sleep.
• Heart rate and resting heart rate. A continuous heart-rate stream, including the evening hours before you fall asleep.
• Stress and Body Battery. Both are derived largely from heart-rate variability and show how much load your body carried and how much it recharged.
• Activity and training. When you trained, how long and how hard — including that late interval session.

Together this is a rich, long-term record of how your body behaves at night. For most people it simply sits in Garmin Connect as a series of daily summaries.

What Garmin Connect shows — and what it leaves open

Garmin Connect answers the question "How was last night?" very well: a score, a status, a trend line. What it doesn't systematically answer is "Why?" — which of your own evening habits tend to come before your good nights and which come before your bad ones.

That is not a flaw in the watch. Answering "why" needs two things a daily summary doesn't have: information about your evening (dinner, drinks, wind-down, stress) and an analysis that compares many of your nights with each other.

Garmin data → SAYA analytics → personal insights

SAYA is an analytics layer on top of the data your Garmin already collects. It is not another wearable and it doesn't replace Garmin Connect.

1. Garmin data. With your permission, SAYA reads your sleep, HRV, heart rate, stress and activity data from your Garmin account.
2. SAYA analytics. It adds metrics that daily summaries don't show: your evening resting heart rate, the HRV-Incline at the start of the night, personal baselines and a Recovery Score.
3. Personal insights. Together with a quick evening log, SAYA looks for personal correlations — for example between dinner timing, late training or evening stress and your sleep and recovery.

The result is not a new score to stare at, but a ranked list of the patterns that show up in your nights.

What analyzing Garmin sleep data can — and can't — do

Wrist-based data is good at trends and weaker at precision. Sleep stages from a watch are estimates, not a clinical sleep study, and a single night can be thrown off by a loose strap, a cold or a late meal. That's why SAYA works with:

• your own baselines instead of population averages,
• many nights instead of one, and
• associations that it labels as such — a correlation in your data is a strong hint, not proof of cause.

The details are documented in how SAYA analyzes your data.

Which Garmin watches work?

Any Garmin that records sleep and overnight HRV and syncs them to Garmin Connect — including recent Forerunner, Fenix, Epix, Venu, Vivoactive and Instinct models. SAYA reads the data through your Garmin account, not directly from the device.

Garmin™ is a trademark of Garmin Ltd. SAYA is not affiliated with or endorsed by Garmin.

In this topic

Sleep Score explained How to read your Garmin Sleep Score — the 0–100 ranges, what feeds into it, where it falls short, and how to connect it with your evening habits. Garmin HRV during sleep How Garmin measures HRV while you sleep, what HRV Status and your baseline mean, what a nightly average hides, and how to read the overnight curve.

Keep reading

• Overnight HRV: how heart rate variability reflects your recovery
• HRV-Incline: understanding overnight HRV recovery
• Personal sleep analytics: find what actually affects your sleep
• How SAYA analyzes your sleep & recovery data

SAYA is a wellness product, not a medical device. Nothing here is a diagnosis or medical advice — if you suspect a sleep or heart condition, please talk to a professional.