IPhone 5 Dead every morning after being charged 100% the night before?

I always make sure my phone is fully charged before I go to sleep.
So I plug it in, it charges, and when it reaches 100% I unplug it and lay it down on my bedside table.
Recently, I've been waking up every morning to a dead iPhone.
I have to plug it in and wait for it to charge again to make it work.
I'm going back to school soon so it's going to be a problem if I have to wait for it to charge every morning.
Does anybody know what's wrong with it?
What should I do to fix it?

Is there a short, a cut or something? Is the wire bent? My phone charger used to do the same. Charge but then drop drastically shortly after being unplugged because it wasn't fully charge though it said it was. Maybe it's stuck on 100%? Have you dropped your phone or anything like that? Lol how long do you sleep? Do you leave any apps on? That can drain battery life? Do you lower the brightness?

I'd get it looked at as it has to be under warrantee. If you want it too charge faster turn on airplane mode.

I charge my 5C to 100% at bedtime and in the morning it's dead. Do I need a new battery or a new phone?

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