https://www.techradar.com/news/your-garmin-watch-probably-just-got-much-better-at-tracking-your-sleep

If you own a relatively recent and high-end Garmin watch, you'll soon have much improved sleep tracking features on your smartwatch.

A new update for the Garmin Connect app will give you further insight into how you slept last night, with it breaking down your evening into sleep stages rather than just light and deep sleep.