Garmin Index Sleep Monitor: New details about upcoming wearable emerge

More details about Garmin’s dedicated sleep tracking wearable have surfaced. Apparently called the Index Sleep Monitor, this upcoming device was first rumored in May 2025, when it was thought to be a competitor to the Whoop 5.0 (curr. $199 at Amazon).

A recent report by Fitness Tracker Test seemingly confirms the name ‘Index Sleep Monitor’ and reveals further details. We already thought that the wearable is designed for the upper arm, though we now know that the comfortable, adjustable strap will be made with Velcro. It uses an optical sensor, expected to be the Garmin Elevate Gen 5 sensor, located in a pocket in the band. Next to the sensor is an LED, thought to indicate the remaining battery level; the wearable is expected to be able to monitor sleep for around one week on a single charge. Plus, an integrated vibration module can be used to gently wake the user, and there is support for tap gesture controls.

The Garmin Index Sleep Monitor is expected to offer features like sleep stage and duration monitoring with an overall sleep score. It may also provide heart rate, SpO2 and skin temperature tracking, with users given a Body Battery score. All of these are existing Garmin sleep features found on wearables like the Venu 3 smartwatch. As such, it is unclear why the company expects customers to choose this sleep tracking device over its other wearables. Plus, it appears to offer less functionality than the Whoop 5.0, as this also offers fitness tracking.

New information suggests that the Garmin Index Sleep Monitor will be available in two sizes, S-M and L-XL, with an RRP of around €170. It is expected to launch before August, though Garmin has yet to officially acknowledge this wearable. The sources behind the Fitness Tracker Test report are unnamed.