Had my S9 for a few days now and noticed that I keep losing around 10% overnight while the phone is doing nothing.
I have AOD switched on (Like I used to on my S7 which was fine with battery) and have the phone on flight mode.
If you look at the green line on the far right of the graph is where it is draining at night (image attached above as a link since the image itself is huge to fit in here)
Any ideas what's causing this? Any logs or apps I can use to figure out why it's happening?