Turning On Pulse Oximeter Sleep Tracking
Before you can use pulse oximeter sleep tracking, you must set your vívosmart® 5 watch as your preferred activity tracker in your Garmin Connect™ account (Activity Tracking Settings).
You can set your watch to continuously measure your blood oxygen level, or SpO2, for up to 4 hours during your defined sleep windowTips 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
> 
> Pulse Ox > During Sleep.