The Index Sleep Monitor is designed to strap to your upper arm so you can leave your smartwatch charging overnight.

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 latest wearable is the Index Sleep Monitor, a band for overnight sleep tracking that means you don't need to wear a watch in bed.