Graph shows same sleep level all night?

Looking at my sleep graph and sleep stages graphics, it shows my sleep level as light sleep for the whole night. I use my Ticwatch Pro as the tracker as have SAA installed on my phone (OnePlus Nord), and my watch. SAA has been working, but suddenly it cannot seem to sense my sleep quality. What might be going on here? My phone and watch had good battery levels and the apps are up to date. I have also disabled all the known OnePlus battery optimisations and locked the app to recent. I did try sonar on my phone as well as my wearable, but turned that off.

Hello Peter,
could you please use the Left ☰ menu > Report a bug, and send me your application logs with the last resulting graph? It will help us find out, what is happening. Thank you.