A number of newer Amazfit smartwatches are capable of sleep-tracking as part of their health-metric suites. They include the GTR and GTS, which have recently been updated further in order to evaluate sleep patterns during the day as well. This involves adding this data to records through its relevant app.
https://www.notebookcheck.net/The-Amazfit-GTS-and-GTR-are-updated-to-monitor-daytime-naps.477613.0.html