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Nightly Recharge™ recovery measurement
Nightly Recharge™ is an overnight recovery measurement that shows you how well you recover from the demands of your
day. Your Nightly Recharge status is based on two components: how you slept (sleep charge) and how well your
autonomic nervous system (ANS) calmed down during the early hours of your sleep (ANS charge). Both components are
formed by comparing your last night to your usual levels from the past 28 days. Your watch automatically measures both
sleep charge and ANS charge during the night.
You can see your Nightly Recharge status on your watch and in the Polar Flow app. Based on what we've measured from
you, you get personalized daily tips in Polar Flow app on exercise, and tips on sleep and regulating your energy levels on
those particularly rough days. Nightly Recharge helps you make optimal choices in your everyday life to maintain overall
well-being and reach your training goals.
How to start using Nightly Recharge?
1. Continuous heart rate tracking needs to be enabled for Nightly Recharge 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. The
sensor on the back of the watch must be in constant touch with your skin. For more
detailed wearing instructions, see Wrist-based heart rate measurement.
3. You need to wear your watch for three nights before you start to see the Nightly
Recharge status on your watch. This is how long it takes to establish your usual level.
Before you get your Nightly Recharge you can view your sleep and ANS measurement
details (heart rate, heart rate variability and breathing rate). After three successful nightly
measurements you can see your Nightly Recharge status on your watch.
Nightly Recharge on your watch
When your watch detects that you've woken up, it will show your Nightly Recharge status on the Nightly Recharge view.
Navigate to the Nightly Recharge view by swiping left or right from the watch face.
The Nightly Recharge status tells you how restorative last night was. Scores for both ANS charge and sleep charge are
taken into account when calculating your Nightly Recharge status. Nightly Recharge status has the following scale: very
poor – poor – compromised – OK – good – very good.
You can also stop the sleep tracking manually if you watch has not yet summarized your sleep. Already
awake? is shown on the Nightly Recharge view when your watch has detected a minimum of four hours of
sleep. Confirm by tapping
and the watch summarizes your Nightly Recharge instantly.
Tap ANS charge or Sleep charge to see more details.
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