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Sleep time preference is the amount of sleep you want to get each night. By default, it is set to the
average recommendation for your age group (eight hours for adults from 18 to 64 years). If you feel
that eight hours of sleep is too much or too little for you, we recommend you adjust your preferred
sleep time to meet your individual needs. By doing this, you'll get accurate feedback on how much
sleep you got in comparison to your preferred sleep time.
2. Continuous heart rate tracking needs to be enabled for Sleep Plus Stages to function. To enable
Continuous HR tracking go to Settings > General Settings > Continuous HR tracking and select On
or Night-time only. Tighten the wristband firmly around your wrist. The sensor on the back of the
watch must be in constant touch with your skin. For more detailed wearing instructions, see
based heart rate
3. Your watch detects when you fall asleep, when you wake up and how long you spent sleeping. The
Sleep Plus Stages measurement is based on recording the movements of your non-dominant hand
with a built-in 3D acceleration sensor and recording your heart's beat-to-beat interval data from your
wrist with an optical heart rate sensor.
4. In the morning you can see your sleep score (1-100) from your watch. You get sleep stages
information (light sleep, deep sleep, REM sleep) and a sleep score after one night, including feedback on
sleep themes (amount, solidity and regeneration). After the third night, you get a comparison to your
usual level.
5. You can record your own perception of your sleep quality in the morning by rating it on your watch or
in the Flow app. Your own rating is not taken into account in the sleep charge calculation, but you can
record your own perception and compare it to the sleep charge assessment you get.
Sleep data on your watch
measurement.
50
Wrist-
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