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

application marketplace only. Users should … not [download applications] from third-party sources, to minimise the risk of installing a malicious applicatio...

https://www.apple.com/jp/privacy/docs/Building_a_Trusted_Ecosystem_for_Millions_of_Apps.pdf