I just got my series 4 last Friday and I really love it. I have been using it for sleep tracking with Pillow. Usually the battery drops 10% over night, which is fine. But this morning I woke up to 6% where I actually fully charged before bed. I was trying to identify the root cause but the apple watch app doesnt tell much. I can see the active use is 2 hours and standby time 7h after last full charge. I am wondering anybody else is experiencing the same issue?