The Index Sleep Monitor tracks up to seven nights of sleep and integrates recorded sleep metrics into the Garmin Connect ecosystem and compatible Garmin smartwatches. The system consists of a 2.5-inch-wide ultra-comfortable band offered in S/M and L/XL lengths and weighing 16–20 grams. The removable monitor module weighs 14.5 grams and charges via a standard Garmin charging cable. Garmin advertises battery life for seven nights based on eight hours of sleep, and real-world use near 7.5 hours per night meets that claim. Sleep details for users without a Garmin watch are accessible only through the smartphone app. The band provides a subtle alternative to rings or watches for nighttime wear.
I've been hoping for a smart ring that could sync with Garmin Connect, allowing me to gather key metrics for recovery and training status without wearing a bulky watch to bed. While a smart ring isn't yet an option, Garmin has introduced a single-purpose wearable to fill the void: the . Also: The best Garmin watches you can buy: Expert tested The Index Sleep Monitor is designed to track a week of sleep and integrate that data into your Garmin Connect ecosystem and smartwatch.
The system consists of an ultra-comfortable band that measures 2.5 inches wide. Two varying lengths are available, depending on your upper arm circumference. The L/XL size fits my arm the best, but there is also an S/M size available. Also: The best smart rings of 2025: I tested and found an obvious winner The band weighs only 16 to 20 grams, depending on the size, and I cannot stress enough how extremely comfortable it is to wear every night.
Battery life is accurate and the light monitor charges quickly The Index Sleep Monitor module is also light at 14.5 grams (0.5 ounce) and charges up with a standard Garmin charging cable. Garmin advertises up to seven nights of sleep tracking with eight hours of sleep. I generally sleep about 7.5 hours per night, and the advertised battery life has been accurate.
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