IPhone dies at night?

I charged my iPhone to 100% last night, closed all background apps that were running and left it by my bed stand. When I woke up this morning, it was completely dead! I have had this problem for over a week and it's a new thing. My phone was been left overnight without being plugged in and gone down only 10% or so. Do I need to take it to be fixed or is there something I should do?

Make sure to put the iPhone in sleep mode. Press the sleep/wake button one time.
A factory restore may help >  Use iTunes to restore your iOS device to factory settings

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