Beddit
The 900-participant study uses learnings from Apple's Tueo Health acquisition and could inform the development of a digital biomarker for asthma.
The three-year investigation will use iPhones, Apple Watches and Beddit trackers to monitor sleep, physical activity, heart rate and other daily signs.
Sensors described in the European Patent Office filing could be placed underneath the user's mattress or pillow.
From the wrist to the finger to the forehead to the bedside, consumer sleep tracking is a booming business.
The rumor jibes with recent comments Apple VP of Health Dr. Sumbul Desai made to MobiHealthNews about sleep.
The filing is a strong indication the Cupertino tech giant isn't done with standalone sleep monitoring devices.