Your ring or signal tracks sleep automatically — no buttons to press, no sleep mode to enable. Just wear it to bed.
What it measures
The ring uses two signals to estimate your sleep: movement and heart rate. When movement drops and your heart rate settles into a resting pattern, the ring recognizes you've fallen asleep. As those signals shift throughout the night, it maps your sleep into stages:
Deep sleep — your most restorative stage. Heart rate and breathing slow down, movement stops. This is when your body repairs tissue, consolidates memory, and recharges physically. You're hardest to wake here.
Light sleep — the transitional stage that makes up most of your night. Your body is winding down or ramping back up. Easier to wake, but still valuable.
REM sleep — where dreaming happens. Your brain is active, processing emotions and consolidating learning. Critical for mental recovery and mood.
Awake — brief periods of wakefulness during the night. These are normal and often unremembered. A few each night is typical.
From there, it calculates total sleep duration, sleep stage breakdown, sleep efficiency, sleep latency (how long it took you to fall asleep), and your Sleep Score.
One thing to know
The ring estimates sleep using movement and heart rate — not brain activity. That's true of all consumer wearables. Occasional small inaccuracies, like brief "awake" periods you don't remember, are normal. Your trends over time are more meaningful than any single night.
If something looks off
Check your ring fit — sensors should sit on the palm side of your finger
Review your sleep in the app and edit your sleep duration if needed(iOS only)