How does an app predict your sleep cycle? Do you have the keep phone on you? | Hacker News

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		exhilaration on Oct 4, 2017 \| parent \| context \| favorite \| on: Productive on six hours of sleep? You’re deluding ... How does an app predict your sleep cycle? Do you have the keep phone on you?

magic_beans on Oct 4, 2017 [–]

It tracks your sound or movement (either via the microphone or the accelerometer) as you sleep to determine your sleep cycles. You set a baseline of typical sleep for 5 days, and after that the app can predict when to wake you up.

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