Overnight battery discharge

Morning all
A rather strange occurance overnight which I hope someone else may have experienced and be able to offer some advice/explanation on.
iPhone 5 with iOS 7.0.2 was at 100% battery on going to bed last night, on waking this morning it was completely flat/dead. So overnight it had totally discharged itself but I really don't know why, it's never done this before.
A rogue app perhaps? An app not shutting down properly maybe? Any ideas guys?
I'm not charging it at work and will see if it will hold it's charge once full again.
Stu

That happens sometimes when you have wifi on and some other things on. To maximize battery life see:
Apple - Batteries - iPod

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Overnight battery discharge

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