Is it a mental disorder ?!

I always have to be moving a part of my body!. Usually I cross my legs when I'm sitting and just move my foot up and down or gently hit my fingers on my desk at school!. But I find it hard to be totally still!. And when I sleep I turn around quite a few times!. It's no big deal but my mum told me it could be a very very mild disorder and that I have to stop it (mostly with my feet)
So is it a disorder or not !? I don't think it's a problem, do you!?Www@Answer-Health@Com

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