Philips DL8790/10 - Manual (Page 44)

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Sleep
The Philips health watch is designed to also be worn at night to allow automatic sleep
tracking. If you are interested in collecting more sleep related information (for example
the time to fall asleep), you can manually start the sleep mode when you intend to fall
asleep, and stop the sleep mode at the moment of waking up in the morning.
To activate sleep mode select Sleep from the menu and press the play icon. The watch
will automatically estimate the moment when you actually fall asleep. Press the stop
icon when you wake up without the intention to resume sleep.
If you wake up in the middle of the night and get out of bed, you do not have to turn off
sleep mode, the watch will automatically account for this. In case you have also set an
alarm, stopping the alarm will also indicate that you have woken up and stop sleep mode.
Data about your sleep will appear in the app within a few hours after you have woken up.
Note: Activation of sleep mode deactivates Bluetooth and sedentary alerts.