If Pillow does not display Blood Oxygen Data please check the following:
Pillow requires an Apple Watch Series 6 or newer
The ability to track Blood Oxygen Levels is only available on Apple Watch Series 6 or later. If you are using an earlier model, Pillow cannot retrieve or display any for Blood Oxygen Levels.
Wear your Apple Watch during sleep
Pillow displays data for Blood Oxygen Levels for each sleep session. If you don't wear your Apple Watch during sleep, Pillow will not be able to retrieve any data for Blood Oxygen Levels.
Check Apple Health Permissions
Pillow requires permission to access Blood Oxygen Levels. To check if that permission is setup correctly:
Open the Health App on your iPhone
Tap on your profile icon on the top right corner
Go to "Privacy" > "Apps" > "Pillow"
Turn ON: "Oxygen" Saturation
Enable Blood Oxygen Levels tracking on the Apple Watch
Open the Settings app on your Apple Watch
Go to Blood Oxygen
Turn ON: "Blood Oxygen Measurements", "In Sleep Mode", "In Cinema Mode"