Samsung SM-R3810ZOAXAR - Manual (Page 72)

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● The Sleep application monitors your sleep duration and body movements while you are sleeping.
To record while you are sleeping:
► Tap the start button when you go to bed, and tap the stop button when you wake up.
The Sleep feature can record sleep cycles twice or more in one 24 hour period. In manual mode, all
sleep time that is detected within the designated period is recorded as the total period of sleep.
Recording sleep duration
1. Tap Sleep on the Home screen.
2. Tap Start.
The sleep duration displays on the screen when sleep recording starts.
3. Tap Stop → OK to stop recording.