I hate to be a Debbie Downer here, but my advice would be to not use anything to track your sleep. I used an app to track my sleep for about 12 years, and the number of times I thought "I feel great today!" - but the app said my sleep was terrible (and vice versa) was so high that I gave up on it altogether.

I've also been reading more and more reports of other people seeing similar results with Oura rings, Apple watches, etc lately. Seems like it's all just junk science.