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1. Continuous heart rate tracking needs to be enabled for Nightly skin temperature
measurement to function. To enable Continuous HR tracking go to Settings > General
Settings > Continuous HR tracking and choose On or Night-time only.
2. Tighten the wristband firmly around your wrist and wear the watch when you sleep. For
detailed wearing instructions, see Wrist-based heart rate measurement.
3. You need to wear your watch for three nights before you start to see your Nightly skin
temperature results on your watch. After three nights, we know your average skin
temperature and show it as baseline (zero). When calculating the baseline, the past 28
nights are taken into account.
Nightly skin temperature on your watch
When your watch detects that you have woken up, it compares the skin temperature measured during sleep to your
average skin temperature, and shows the variation to that average. Navigate to the Nightly skin temperature view by
swiping left or right from the watch face.
You can also stop the sleep tracking manually if you watch has not yet summarized your sleep. Zzz... is
shown on the Nightly skin temperature view when your watch has detected a minimum of four hours of
sleep. Already awake? appears when you tap the display. Confirm by tapping
and the watch summarizes
your sleep instantly. If sleep isn't recognized, skin temperature won't be available.
The information displayed on the Nightly skin temperature view includes:
1. Variation to your average skin temperature.
2. Your skin temperature compared to usual level. Scale: Below usual – Usual – Above
usual – Much above usual.
Variation within +-1 degrees Celsius or +-1.8 degrees Fahrenheit is considered Usual. If the
variation to your average skin temperature is more than +2 degrees Celsius or +3.6
degrees Fahrenheit, it is considered Much above usual.
3. A graph showing your skin temperature measurements from the last 7 nights.
Nightly skin temperature in the Polar Flow app
Sync your watch with the Polar Flow app to see your skin temperature data in the app. Note that you must sync your
watch using the Flow app. Skin temperature data cannot be synced using the Polar FlowSync software on your
computer.
In the Polar Flow app, choose Skin temperature from the menu (1). From the Skin temperature view (2), you can check
the result of last night's measurement and also see how your skin temperature varies over the course of a week or month.
You can also check the result of last night's measurement from the card in the Diary (3). Tapping the card opens the Skin
temperature view.
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