Garmin’s new sleep tracker offers a week of battery life
Sleep tracking is nothing new in Garmin’s fitness watches, but the company’s latest wearable is a dedicated smart sleep band. The Index Sleep Monitor offers week-long battery life with continuous pulse ox tracking for monitoring your blood oxygen saturation while you sleep. Garmin’s tracker is worn on the upper arm — which should hopefully make it more comfortable — where it tracks a variety of metrics: skin temperature; light, deep and REM sleep stages; and variations in your heart rate and br