High battery drain on Garmin Vivoactive 4

Hello,
I am not sure if this belongs here or in bugs. When I use the app for the watch there is a massive battery drain. Approximately 50% drain overnight. The watch’s built in sleep tracking use very little power even with continuous heart rate and SPO2 monitoring. Is there a way to improve the efficiency of the app? Also is there a way to utilize the SPO2 data the watch can record? I would like to continue using sleep. I find the audio monitor very useful but if I cannot find a solution to the battery drain I would have to give up the app.

Thank you