Originally Posted by Sephiroth_dude
My battery was at 40% when I was going to bed the other night and when I woke up it was completely dead
It could be that you had your phone at wrong temperature or you're running too many apps or that you battery is faulty. Go into setting > more> battery and start looking at the stats. If they're not detailed enough there's probably an app you could get (I used to use BatteryBot) that may show more, but you'd have to run it for a few days.
I haven't really been using my phone at all today. Received one or two calls and watched an episode of Archer on Netflix, that's about it. It's been 16 hours+ since I last charged it. There's still apparently 64% remaining. Something definitely sounds amiss if you're leaving your phone idle and it's draining like that.
Wifi/4G, Air view, smart pause and data sync have been on all day.
Also, I'd highly recommend the automateIt app. You can set up customs rules for when you're phone is idle. So battery may be conserved.