Galaxy Watch Active2 and Watch3 both have the ability to track your sleep when you wear your watch to bed. It can track the different sleep stages, including REM sleep, and provide insight in your sleep quality on a nightly basis.
It gives you a sleep score, based on the duration of your sleep, in addition to motion and heart rate data it measures while you're in bed. To get started tracking your sleeping patterns, go to your apps tray and open Samsung Health. Tap on Sleep and there you can see all your sleep tracking information. When you're ready for bed, tap Start to begin the tracking to see if you're getting a restful night's sleep.
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