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Sleep settings

Sleep monitoring needs bedtime / risetime settings.

Bracelet Plan​

The sleep monitoring is enabled according to the plan set to the bracelet.

Bracelet plan documentation here

Bedtime / Risetime​

The sleep monitoring uses the bracelet battery, and to avoid a high consumption, the sleep is not monitored all day long. This is why it is important to set a theoretical bedtime and risetime to the bracelet. The sleep will be monitored starting 2 hours before the theoretical bedtime and 3h maximum after the rise time (sleep stop conditions below).

Sleep Stop​

The sleep is stopped automatically in the morning after 250 steps. If the users doesn’t reached 250 steps it will be stopped automatically 3h after the rise time by the bracelet.

Sleep session​

The sleep monitoring provides a sleep session (start, stop, 30 seconds slots), then the sleep session is filtered to obtain the best user friendly result. Here are the filtering steps:

  • Remove awake blocks at the beginning and the end of the night.
    • The sleep will always start and end with a sleep stage (light / REM / deep)
  • Noise filtering: the graph is flattened, the slots have to last at least 2 min straight
    • Example: REM sleep during 20 min, then one 30 seconds awake slot, and after 10 more minutes of REM sleep: the 30s awake will be filtered and will not appear
  • 1 minute slots
    • Slots have 0 seconds (22:01:00, 22:02:00, etc)
    • Start and stop time have 0 seconds too

Sleep process technically:​

When the sleep monitoring is active on the bracelet, data is generated, we collect this raw data in the app and build a .wiff file

When the sleep is ready (after 250 steps), the wiff file is processed by the Philips Library (in the app) and will give a sleep session.

A wiff file can contain multiple nights, and multiple sleep sessions.

The app tries to process the wiff file 4 times maximum, if a sleep session cannot be identified (bracelet not worn during the night for example), the wiff file will be deleted. The first trial comes after 250 steps, then we wait 2 minutes between each trials.