Turning On Pulse Oximeter Sleep Tracking
Before you can use pulse oximeter sleep tracking, you must set your Lily® 2 watch as your primary wearable in your Garmin Connect™ account (Unified Training Status).
You can set your watch to continuously measure your blood oxygen level, or SpO2, for up to 4 hours during your defined sleep window (Tips for Erratic Pulse Oximeter Data).
NOTE:
Unusual sleep positions can cause abnormally low sleep-time SpO2 readings.
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Press
to view the menu.
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Select
> 
> Sleep Pulse Ox.