be disjointed, disaggregated, or separated into different materials by mechanical actions such 
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https://www.apple.com/jp/environment/pdf/Apple_Regulated_Substances_Specification_Sept2018.pdf

Estimating Sleep Stages from Apple Watch Estimating Sleep Stages from Apple Watch September 2023 Overview Apple Watch users can track their sleep with Apple...

https://www.apple.com/jp/healthcare/docs/site/Estimating_Sleep_Stages_from_Apple_Watch_Sept_2023.pdf