The Philips health watch is also designed to be worn at night, to allow automatic sleep tracking. If you are interested in collecting extra sleep information, for sleep tracking (for example falling asleep time, sleep efficiency), you can indicate manually when you plan to go to sleep and wake-up, by activating the sleep mode For accurate sleep tracking indicated sleep intent is essential.
To activate sleep mode select ‘sleep’ from the menu and press the play icon. The watch will automatically measure the moment when you actually fall asleep. Press the stop icon at the time you wake up.
If you wake up in the middle of the night and get out of bed, you don't have to turn off sleep mode, the watch will automatically account for this. Data about your sleep will appear in the app, a few hours after you have woken up.
Indicating when you go to bed, deactivates Bluetooth.