Will over charging my iPhone 4S so damage to my battery life span?

I usually charge it when I go to sleep 930pm till around 6am when I wake up, and I understand it only takes 2hrs to charge the battery. Will this do damage to my battery lifespan? I know it has happened to my other phones I had in the past (androids) and I don't want that to happen to this one.

I have a iphone 4s too and i lave it charging all night. I don't see any damage battery is normal.

You'll be alright

This will heat up the battery, which could potentially damage it. Also, batteries just naturally wear out as they get used, like a light bulb getting dimmer and dimmer before it finally burns out.

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