Yes you can, you can use your Smart Ring to also track your sleep.

To monitor your sleep, wear the smart ring while sleeping. The sleep analysis provides a Sleep Score that indicates your sleep quality. The higher the Sleep Score, the better your sleep.

To review your sleep record, open the App and switch to "Sleep" tab and scroll through the screen to reveal more analysis. To view data for a different date, tap on the icon next to the date, then choose a date for which data is available (marked by dot underneath the date). To view weekly or monthly records, tap Week or Month