Does the alarm clock drain the iPhone 4 battery?

My iPhone 4 battery drains overnight and I was wondering if the alarm clock has something to do with it. If this is not the case, is there a way to not have the battery drain overnight?
Please let me know of anything you know to conserve battery life as much as possible.
_

Leaving it overnight without charging will use small amount of battery. Reason is that it is still connected to a 3G network which draws some power to maintain a good reception. Anything not in sleep mode will use some battery.
To conserve battery life as much, just keep it in the charger overnight. It will not harm the battery as when the phone is fully charged, the charging stops.
I normally keep my phone in my charger when I'm home, but when I go out somewhere I unplug it.

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Does the alarm clock drain the iPhone 4 battery?

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