Why so much of my battery drains during the night min 6 to max 15 percent have been dropped during the past week on my a 20s this is so big for a device that already has a small 4000 mah battery while on the other side my mom's j5 prime battery drops to only 1 percent during night please suggest me some way to prevent this 
I just wanted to say that not only when I am sleeping but whenever I turn off my phone it use more battery than it it would have if I were using my phone please suggest some soln
