Researchers at Harvard have published the results of a study that analyzed more than 94,000 nights of Apple Watch sleep data to better understand how sleep patterns change during perimenopause. Here are the details.
Study analyzed more than 94,000 nights of Apple Watch sleep data
For the past several years, Apple has used the Apple Watch as a way to support large-scale health studies through the Apple Research app.
That includes the Apple Women’s Health Study, the Apple Heart and Movement Study, and the Apple Hearing Study, which launched in 2019 with research partners including Harvard, Brigham and Women’s Hospital, the American Heart Association, and the University of Michigan.
In February 2025, Apple said those studies have since grown to more than 350,000 participants across the US.
