How does sleep cycle app know when your asleep?

How does sleep cycle app know when your asleep?

Apple Watch Sleep Tracking: How it actually works // Setup, Tested, Details, Comparisons

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answers (1)

Answer 1
December, 2020
Sleep Cycle works by using the accelerometer inside your iPhone (the part that knows when you turn it sideways) to detect your movements as you sleep. It'll then use this data to wake you at the optimal time in your 'wake up phase' which you can set to be between 90 and 10 minutes long.

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