HT4543 How often should the fan turn on while my macbook pro is asleep?

My macbook pro 17" is sitting on the counter, plugged in, with the lid closed. The fan is turning on every couple of minutes for 10 seconds or so. It seems like my battery is draining more when it's asleep than it used to, could this be the reason? Is that normal?

There is a light on the front right hand corner of the case. If that comes on then goes off and repeats every few seconds then the system is asleep. If it never comes on or comes on and stays on then the system is not asleep.

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