What is required for the Apple Watch's sleep apnea feature to work?

Question

For the sleep apnea detection feature of the Apple Watch to work optimally, what other requirements must be met?

Answer 1

For the sleep apnea detection feature to function adequately, the Apple Watch utilizes formal S9 system in package (SIP) or an enhanced version. This aids the watch in delivering the performance targets by processing accelerometer data onto the device itself.

Comments

I think older Apple Watches also have enough processing power to do this.

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Is it for series 7 as well??

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It can’t detect because the battery is dead by the time you fall asleep

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What if my watch hand is usually tucked under my pillow at night?