Will Fitbit's sleep apnea tracking actually work?

Fitbit, the digital health company whose wristbands have become synonymous with the whole activity-tracking movement, is trying to bring its health monitoring game to the next level — by focusing on a sleep disorder that affects millions of Americans.Fitbit has said that it’s working with a combination of optical sensors and machine learning tools in its R&D labs to potentially address a condition in which people stop breathing in their sleep, called sleep apnea. Its new Ionic sm