N3 (deep or slow-wave sleep). REM sleep is distinct from non- REM sleep in three main ways: the namesake rapid eye movements, changes in respiration pattern...

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

Using AirPods Pro 2 with iPhone and iPad to Help Protect, Assess, and Assist Hearing White Paper Using AirPods Pro 2 with iPhone and iPad to Help Protect, A...

https://www.apple.com/jp/health/pdf/Hearing_Health_Features_on_AirPods_Pro_2_October_2024.pdf