Maybe the app I'm using for sleep tracking does not track enough things (sound is tracked with the phone, for instance, but heartbeat is tracked with the watch)

Maybe the app I'm using for sleep tracking does not track enough things (sound is tracked with the phone, for instance, but heartbeat is tracked with the watch), but it only seems to consume 3-5% of battery of my watch (Series 2, small). When I started tracking my sleep I changed my charging pattern from night to "while preparing breakfast" (after waking up) and "while at shower" (evening). Of course, 8 months is a different game :)