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Don't have a sony but have used other laptops that do a similar thing. The fan is on a temperature sensor so only comes on when its hot, if its boarderline temp it comes on then goes off once its cooled a bit. If its not getting stupidly hot and works ok I wouldnt worry about it.
I've got one and my fan seems to be on all the time, but I do leave it turned on for long periods. Saying that it keeps turning on and off at the moment.