protocols approved by an institutional review board involving multiple sites. They underwent ground truth monitoring with either at-home or in-lab sleep rec...

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

each time the site is visited. Safari is designed to hide the user’s identity when sharing information with Apple. Analytics data shared with Apple is not a...

https://www.apple.com/jp/safari/docs/Safari_White_Paper_Nov_2019.pdf