How can I track my sleep time on a WearOS?
The Cardiogram app installed on your watch has the ability to track your sleep, but please note that this feature is currently in the Beta testing phase.
Did you know that you can track your sleep duration using a 3rd-party app like Sleep as Android? Once you install the app, it will write the sleep data to Google Fit. You can then use Cardiogram to read the sleep data from Google Fit and display your sleep duration within the Cardiogram app. Other apps that you can use for this purpose are Pillow and Sleep Cycle.