Awake detection setting for tracking with smartwatch

Hi,
I wonder whether I have to change the awake detection settings, if I use my Samsung Gear Sport watch for sleep tracking without positioning my phone on the bed. E.g., is “movement intensity” read by the accelerometer in the phone or the watch?
Bonus question: Will disabling sleep tracking in Samsung Health affect Sleep as Android’s readings? I figured communication to a single app might improve battery life.
Thank you :slight_smile:

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Us helpful my android phone.