why my battery for Note drained so fast one? I remember last night before I was sleeping it was 81% and the next day i wake up it is 40+% only. It drains like 40% whenever I am sleeping overnight. My Note is 1 week old and the first few days it just reduces 5% battery only when i am not using. Btw, I haven't rooted my Note yet and so does my friend, but his Note just reduce by 5% when sleeping overnight. I have closed all application and even put Silent when I am sleeping yet it still drain so much battery and display brightness i even set to minimum. Is it my battery problem?