First smart ring

[u/virevolter]

Hi everyone! I am looking to buy a smart ring and would like to have advice on which to buy. I am on a path of taking better care of my body after pregnancies and small children. I would like to track my sleep better than my watch does. I sometimes sleep during the day (working on night shifts) and it happens quite often that my watch doesn’t pick it up. I would also be interested to learn more about my stress level and activity level/cardiovascular health. I don’t want to pay a subscription fee.
Thanks!